NCERT Solutions Class 4 Maths Chapter 8 Weigh It Pour It

F R E E S T U D Y M AT E R I A L F O R E V E R Y S T U D E N T

C L A S S 4 · M AT H S

NCERT Solutions

Chapter 8: Weigh It, Pour It

NCERT Textbook — Math Mela

BOOK PAGES SECTIONS QUESTIONS MEDIUM

115 – 127 18 58 English

Solutions, notes, sample papers & more at 59 pages

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

CLASS 4 · MATHS · MATH MELA

NCERT Solutions — Chapter 8: Weigh It, Pour It
Chapter 8 of Math Mela takes us to a vegetable market and a sweet shop to weigh things in kilograms and
grams, and then to bottles, droppers and milk cans to pour out litres and millilitres.

TEXTBOOK BOOK PAGES

Math Mela (Class 4) 115 – 127

SECTIONS QUESTIONS

18 58

MEDIUM

English

In-text Questions — Page 115

Page 1 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Weigh It, Pour It

Q1 Look at the pictures given and write the names of the animals from heaviest to
lightest.

Ant Squirrel Dog Elephant Giraffe

The five animals printed at the top of page 115.

Ant Squirrel Dog Elephant Giraffe

The five animals printed at the top of page 115.

From heaviest to lightest, the animals are:

Page 2 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

1. Elephant

2. Giraffe

3. Dog
4. Squirrel

5. Ant

Elephant, Giraffe, Dog, Squirrel, Ant.

Why it happens: A bigger body has more stuff inside it, so it presses down harder.
An elephant is the biggest animal here, so it is the heaviest. An ant is so tiny that it
sits on a blade of grass without bending it.

Tip: You cannot put an elephant on a balance! For very big animals we compare by
size and by what we already know about them.

Q2 Write the name of the heaviest object in your home. How did you know?

This is about your own home, so write what you really find there.
Do it like this:

1. Look around your home and pick out the big, solid things.
2. Try to lift each one a little, or try to push it.
3. The one that does not move at all is the heaviest.

Sample answer: The heaviest object in my home is the almirah. I know it because my father
and my uncle together could hardly push it when we cleaned the room.

Why it happens: A thing feels heavy when we have to pull hard against it. The
harder we must pull, the heavier it is. So pushing and lifting is a way of comparing
weights without a balance.

Page 3 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
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Do you carry your school bag with ease or with some effort?
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Q3

m l as
.co a g
a
s em
agl for your own bag. Both answers can be right.
Answer
Check it this way: pick the bag up with one hand and hold it for a slow count of ten.

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If your arm does not get tired, the bag is light. You carry it with ease.
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If your arm starts to ache, the bag is heavy. You carry it with effort.
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a
Sample answer: I carry my school bag with some effort on Monday, because six books and my

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water bottle go in together. On Saturday only two books go in, so it feels easy.
co
em.
c o m l as
Why it happens: More books inside means more weight. Weight is how heavily a
g
thing .presses down, so a fuller bag always presses down more.
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a gla
Tip: A school bag should weigh less than about one-tenth of your own weight. Take
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out the books you do not need that day.

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Write the name of the heaviest book in your bag. How did you know?

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Q4

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a
Look inside your own bag and compare the books two at a time.

ag l 1. Hold one book in your left hand and one in your right hand.
2. The hand that goes down is holding the heavier book. Keep that one.
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3. Now compare the winner with the next
m
book, and go on till one book is left.
a
l a sein my bag is my atlas. I held it in one hand and each other
agtime, the hand with the atlas went down.
Sample answer: The heaviest book
book in the other hand. Every

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Why it happens: Your two hands work just like the two pans of a balance. The
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heavier side always goes down and the lighter side goes up.

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ag Tip: A thick book with big pages usually has more paper in it, so it is usually heavier.
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m ase
.co


a g l Page 4 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q5 What is your weight? How did you know?

Write your own weight in kilograms (kg).
To find it out:

1. Stand on a weighing machine at home, at school or at a shop.
2. Keep both feet on it and stand still.
3. Read the number that shows up. That number is your weight in kg.

Sample answer: My weight is 28 kg. I stood on the weighing machine in our health room and
the screen showed 28.

Why it happens: A weighing machine does the comparing for us. It shows the
weight straight away as a number, so we do not need to guess.

Tip: Most Class 4 children weigh between about 25 kg and 35 kg. If your answer is
far away from that, check that you read the machine correctly.

Fun at Vegetable Market! — Page 115

Page 5 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Rita and Shabnam at the market

Q1 What do you think will be the weight of the half pumpkin?

1 2

Whole pumpkin Iron weight Half pumpkin Half pumpkin

3

Half pumpkin Green vegetables

The three pan balances drawn beside the vegetable cart on page 115.

1 2

Whole pumpkin Iron weight Half pumpkin Half pumpkin

3

Half pumpkin Green vegetables

The three pan balances drawn beside the vegetable cart on page 115.

The three balances tell the whole story.

Page 6 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Balance 1: whole pumpkin = one iron weight

Balance 2: half pumpkin = the other half pumpkin

So the two halves are equal.
Half pumpkin = half of the whole pumpkin

So the half pumpkin weighs half of whatever the whole pumpkin weighs.
Sample answer: If the seller’s weight is 2 kg, then the whole pumpkin is 2 kg. 2 kg is 1 kg and 1
kg, so each half is 1 kg.

Why it happens: Balance 2 shows the two halves balancing each other. Two equal
pieces make the whole, so one piece must be half of the whole.

Tip: In the book the number stamped on the little iron weight is printed too small to
read. Read it in your own copy, then take half of it. Balance 3 also tells you that the
half pumpkin weighs the same as that heap of green vegetables.

Let Us Do — Page 116
Estimating weight

Q1 Estimate the weight of the following and put a tick mark (✓) in the appropriate cell.
Try to verify if your guess is correct by using a weighing balance.

FRUITS AND ESTIMATION: ESTIMATION: ACTUAL ACTUAL
VEGETABLES LESS THAN 1 MORE THAN 1 WEIGHT: WEIGHT:
KG KG LESS THAN MORE
1 KG THAN 1 KG

6 Bananas

5 Potatoes

10 Tomatoes

15 Onions

This is the table printed in the book:

Page 7 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

FRUITS AND ESTIMATION: ESTIMATION: ACTUAL ACTUAL
VEGETABLES LESS THAN 1 KG MORE THAN 1 WEIGHT: WEIGHT:
KG LESS THAN 1 MORE THAN
KG 1 KG

6 Bananas

5 Potatoes

10 Tomatoes

15 Onions

First guess, then weigh. Here is a filled sample:

FRUITS AND ESTIMATION: ESTIMATION: ACTUAL ACTUAL
VEGETABLES LESS THAN 1 KG MORE THAN 1 WEIGHT: WEIGHT:
KG LESS THAN 1 MORE THAN
KG 1 KG

6 Bananas ✔ ✔
5 Potatoes ✔ ✔
10 Tomatoes ✔ ✔

15 Onions ✔ ✔

6 bananas: about 120 g each → 6 × 120 g = 720 g → less than 1 kg

5 potatoes: about 120 g each → 5 × 120 g = 600 g → less than 1 kg

10 tomatoes: about 110 g each → 10 × 110 g = 1100 g → more than 1 kg

15 onions: about 100 g each → 15 × 100 g = 1500 g → more than 1 kg

Why it happens: 1 kg is 1000 g. So we only have to ask one thing each time: is the
total more than 1000 g or less than 1000 g?

Tip: Your own fruits may be bigger or smaller than these. That is fine. Weigh them
on a balance and write the real answer in the last two columns.

Let Us Explore — Pages 116–117

Page 8 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

Packets that make 1 kg
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Look at the pictures. You may also try doing the same.
m a g
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a
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a

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Daal packet, 1 kg 2 packets of 500 g

a g
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a
m a s
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b

m .co
l a se
a g

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m as e
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Daal packet, 1 kg
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4 packets of 250 g
a
se m
g l a
a
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c
com g l a
m . a
ase
agl

co m
m .
m as e
.co Daal packet, 1 kg
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10 packets of 100 g

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a The three balances of ‘Let Us Explore’. Each one has a 1 kg daal packet on the left pan.
c
m .
m a s e
m . co agl
l a se
ag Each one has a 1 kg daal packet on the left pan.

The book shows three balances.

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m .
m ase
.co


a g l Page 9 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

PICTURE LEFT PAN RIGHT PAN WHAT THE BALANCE SHOWS

a Daal packet of 1 2 packets of 500 g 500 g + 500 g = 1000 g = 1 kg
kg

b Daal packet of 1 4 packets of 250 g 250 g + 250 g + 250 g + 250 g = 1000 g = 1
kg kg

c Daal packet of 1 10 packets of 100 10 packets of 100 g = 1000 g = 1 kg
kg g

From these three pictures we learn:

2 packets of 500 g = 1000 g = 1 kg, so 500 g = half of 1 kg

4 packets of 250 g = 1000 g = 1 kg, so 250 g = one-fourth of 1 kg

10 packets of 100 g = 1000 g = 1 kg, so 100 g = one-tenth of 1 kg

Why it happens: The two pans stay level only when both sides carry the same
weight. So whatever we put on the right pan must add up to exactly 1000 g.

Tip: Try it in class. Take a 1 kg packet and see how many 500 g, 250 g and 100 g
packets of sugar, poha or daal you need to balance it.

Let Us Find — Page 117

Page 10 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Balancing a 500 g packet

Q1 How many 250 g daal packets will balance one 500 g daal packet? Draw as many
packets of 250 g on the empty pan such that it balances the 500 g packet shown on
the left pan of the balance.

empty

Daal packet, 500 g empty pan

The balance printed on page 117: a 500 g daal packet on the left pan.

empty

Daal packet, 500 g empty pan

The balance printed on page 117: a 500 g daal packet on the left pan.

Keep adding 250 g packets until the two pans carry the same weight.

Page 11 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

1 packet → 250 g — too light

2 packets → 250 g + 250 g = 500 g — equal!

So we must draw 2 packets of 250 g on the empty pan.

Daal packet, 500 g 2 daal packets, 250 g each

The empty pan after the right number of 250 g packets is drawn on it.

Why it happens: 250 g is half of 500 g. Two halves always make one whole, so two
250 g packets make exactly one 500 g packet.

Page 12 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q2 What did you find? 250 g = ________ of 500 g ( ½ , 2 )

empty

Daal packet, 500 g empty pan

The balance printed on page 117: a 500 g daal packet on the left pan.

empty

Daal packet, 500 g empty pan

The balance printed on page 117: a 500 g daal packet on the left pan.

Two packets of 250 g balanced one packet of 500 g.

250 g + 250 g = 500 g

So 250 g = ½ of 500 g

The blank is filled with ½ (half).

Page 13 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
Why it happens: When two equal pieces make a whole, each piece is half of that

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l
whole. The other choice, 2, would mean 250 g is twice 500 g — and that is not true,
. c o a g
m
because 250 g is the smaller weight.
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aTip: In the same way, 500 g = ½ of 1 kg and 250 g = ¼ of 1 kg.

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Let Us Find — Page 118 a

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m a s
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l a se
a g

co m
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m as e
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se m
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a
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com g l a
m . a
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m as e
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se m
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a c
m .
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a

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m ase
.co


a g l Page 14 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Which way will the balance tilt?

Q1 Draw arrows to indicate which side the pan balance will tilt? One is shown for you.
a.

6 soap bars, 200 g each Salt packet, 1 kg

Balance (a): soap bars on the left pan, a salt packet on the right.

6 soap bars, 200 g each Salt packet, 1 kg

Balance (a): soap bars on the left pan, a salt packet on the right.

This one is already done in the book. Let us check why.

Page 15 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Left pan: 6 × 200 g = 1200 g

Right pan: 1 kg = 1000 g

1200 g > 1000 g

So the left pan (the soap bars) goes down and the right pan goes up.

6 soap bars, 200 g each Salt packet, 1 kg

The same balance after it settles.

Why it happens: A pan balance is a fair judge. The side carrying more grams always
goes down, and the side carrying fewer grams rises.

Page 16 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q2 Draw arrows to indicate which side the pan balance will tilt? One is shown for you.
b.

8 chocolate bars, 100 g each Salt packet, 1 kg

Balance (b): chocolate bars on the left pan, a salt packet on the right.

8 chocolate bars, 100 g each Salt packet, 1 kg

Balance (b): chocolate bars on the left pan, a salt packet on the right.

Add up the left pan first.

Page 17 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Left pan: 8 × 100 g = 800 g

Right pan: 1 kg = 1000 g

800 g < 1000 g

So the right pan (the 1 kg salt packet) goes down and the left pan goes up.

8 chocolate bars, 100 g each Salt packet, 1 kg

The same balance after it settles.

Why it happens: A pan balance is a fair judge. The side carrying more grams always
goes down, and the side carrying fewer grams rises.

Page 18 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
Draw arrows to indicate which side the pan balance will tilt? One is shown for you.
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Q3

m l as
.co
c.

a g
se m
g l a
a

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g l as
a

co m
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m l as
m .co a g
l a se
a g 5 haldi packets, 50 g each Salt packet, 1 kg

m a s
.co agl
Balance (c): haldi packets on the left pan, a salt packet on the right.

se m
g l a
a

co m
m .
m as e
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se m
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a
se m
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m 5 haldi packets, 50 g each l a sepacket, 1 kg
.co ag
Salt

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a Balance (c): haldi packets on the left pan, a salt packet on the right.
c
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. co agl
Add up the left pan first.
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a

co m
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m as e
.co


a g l Page 19 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Left pan: 5 × 50 g = 250 g

Right pan: 1 kg = 1000 g

250 g < 1000 g

So the right pan (the 1 kg salt packet) goes down and the left pan goes up.

5 haldi packets, 50 g each Salt packet, 1 kg

The same balance after it settles.

Why it happens: A pan balance is a fair judge. The side carrying more grams always
goes down, and the side carrying fewer grams rises.

Page 20 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q4 Draw arrows to indicate which side the pan balance will tilt? One is shown for you.
d.

3 tea leaves packets, 250 g each Salt packet, 1 kg

Balance (d): tea leaves packets on the left pan, a salt packet on the right.

3 tea leaves packets, 250 g each Salt packet, 1 kg

Balance (d): tea leaves packets on the left pan, a salt packet on the right.

Add up the left pan first.

Page 21 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Left pan: 3 × 250 g = 750 g

Right pan: 1 kg = 1000 g

750 g < 1000 g

So the right pan (the 1 kg salt packet) goes down and the left pan goes up.

3 tea leaves packets, 250 g each Salt packet, 1 kg

The same balance after it settles.

Why it happens: A pan balance is a fair judge. The side carrying more grams always
goes down, and the side carrying fewer grams rises.

Page 22 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q5 Match the unit convenient for measuring each of the following objects?

OBJECTS PRINTED ON PAGE 118 KILOGRAMS GRAMS

A baby

An eraser

A drawing pin

A geometry box

A pile of books

A paper clip

A feather

A wooden table

A refrigerator

A pen

A wrist watch

These are the things printed on page 118:

Page 23 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

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OBJECTS PRINTED ON PAGE 118 KILOGRAMS GRAMS

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A baby
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An eraser
a
A drawing pin

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A geometry box
em . ag
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A pile of books
a
A paper clip
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A feather

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A wooden table

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a A refrigerator
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A pen

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A wrist watch

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Big, heavy things go with kilograms. Small, light things go with grams.

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OBJECT UNIT WE SHOULD USE

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Am
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as
baby

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Kilograms

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An eraser Grams

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A drawing pin
.com Grams
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as Grams
agl
A geometry box

A pile of books Kilograms

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A paper clip Grams

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Grams

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agl A wooden table Kilograms
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A refrigerator Kilograms

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A pen

A wrist watch a g Grams

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a g l Page 24 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Why it happens: A gram is very small — a paper clip is about 1 g. Counting a
refrigerator in grams would need thousands of grams, which is hard to say. So for
heavy things we use the bigger unit, the kilogram.

Tip: The book has already joined the baby to Kilograms with an arrow, to show you
how to do the rest.

Let Us Do — Page 119
Erasers of 10 g

Q1 How many erasers will weigh the same as a 50 g Haldi packet?

10 g 10 g 10 g 10 g 10 g

10 g 10 g 10 g 10 g 10 g

The ten erasers printed at the top of page 119.

10 g 10 g 10 g 10 g 10 g

10 g 10 g 10 g 10 g 10 g

The ten erasers printed at the top of page 119.

Each eraser in the picture weighs 10 g.

Page 25 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Count in tens till we reach 50:

10 g, 20 g, 30 g, 40 g, 50 g

That is 1, 2, 3, 4, 5 erasers

5 erasers weigh the same as a 50 g Haldi packet.

Why it happens: Five tens make fifty. So five erasers of 10 g each make 50 g.

Q2 A 100 g soap bar will weigh the same as ________ erasers.

10 g 10 g 10 g 10 g 10 g

10 g 10 g 10 g 10 g 10 g

The ten erasers printed at the top of page 119.

10 g 10 g 10 g 10 g 10 g

10 g 10 g 10 g 10 g 10 g

The ten erasers printed at the top of page 119.

Each eraser in the picture weighs 10 g.

Skip-count by 10 up to 100:

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

That is 10 erasers

A 100 g soap bar weighs the same as 10 erasers.

Page 26 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Why it happens: Ten tens make one hundred. The picture in the book shows exactly
10 erasers, and together they make 100 g.

Q3 ________ erasers will weigh the same as 250 g sugar.

10 g 10 g 10 g 10 g 10 g

10 g 10 g 10 g 10 g 10 g

The ten erasers printed at the top of page 119.

10 g 10 g 10 g 10 g 10 g

10 g 10 g 10 g 10 g 10 g

The ten erasers printed at the top of page 119.

Each eraser in the picture weighs 10 g.

10 erasers = 100 g

20 erasers = 200 g

5 more erasers = 50 g

200 g + 50 g = 250 g

20 + 5 = 25 erasers

25 erasers will weigh the same as 250 g sugar.

Page 27 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Why it happens: Every eraser adds 10 g. To reach 250 g we need as many tens as
there are in 250, and 250 has 25 tens.

Let Us Think — Page 119
Boxes of Sweet

Q1 Mr Das wants the sweets in boxes weighing 500 g each.

1 kg of Kaju-katli is 1000 g. Fill boxes of 500 g until 1000 g is used up.

500 g + 500 g = 1000 g
That is 2 boxes

Mr Das will need 2 boxes.

Why it happens: Packing 1000 g into boxes of 500 g is the same as asking how
many 500 g make 1000 g. We keep adding 500 g until we reach 1000 g.

Q2 Mrs Fernandes wants the sweets in boxes weighing 250 g each.

1 kg of Kaju-katli is 1000 g. Fill boxes of 250 g until 1000 g is used up.

250 g + 250 g + 250 g + 250 g = 1000 g

That is 4 boxes

Mrs Fernandes will need 4 boxes.

Why it happens: Packing 1000 g into boxes of 250 g is the same as asking how
many 250 g make 1000 g. We keep adding 250 g until we reach 1000 g.

Page 28 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
Mrs Khan wants the sweets in boxes weighing 100 g each.
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Q3

m l as
.co a g
a
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aglof Kaju-katli is 1000 g. Fill boxes of 100 g until 1000 g is used up.
1 kg

co m
. ag
100, 200, 300, 400, 500, 600, 700, 800, 900, 1000
e m
That is 10 boxes
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a
Mrs Khan will need 10 boxes.
co m
se m.
o m
c g make 1000 g. We keep adding 100 g until we reach l a
g 1000 g.
Why it happens: Packing 1000 g into boxes of 100 g is the same as asking how
m .100 a
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many

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a
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Mr Patel wants the sweets in boxes weighing 50 g each.
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Q4

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ANSWER a g
m
1 kg of Kaju-katli is 1000 g. Fill boxes of 50 g until 1000 g is used up.

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2 boxes of 50 g = 100 g

s m 100 g needs 2 boxes
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1000 g has ten 100 g in it

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10 × 2 = 20 boxes
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ase
Mr Patel will need 20 boxes.
agl

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.
Why it happens: Packing 1000 g into boxes of 50 g is the same as asking how many

s
50 g make 1000 g. We keep adding 50 g until we reach 1000 g.
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In-text Questions — Page 120
m .
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co m
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m ase
.co


a g l Page 29 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Weighing Machines / Let Us Do

Q1 Do you know the different types of weighing machines used to weigh different
objects?

Yes. Different jobs need different machines.

WEIGHING MACHINE WHERE WE SEE IT WHAT IT WEIGHS

Pan balance (tarazu) Vegetable and grocery Vegetables, daal, rice
shops

Beam balance with weights Grain shops Sacks of grain, using 1 kg and 5 kg
weights

Digital kitchen scale Homes and bakeries Small amounts like 100 g of flour

Bathroom weighing machine Homes, schools, clinics The weight of a person

Big platform weighing Warehouses and mandis Heavy sacks and boxes
machine

Why it happens: A machine must be able to feel the weight it is given. A kitchen
scale would break under a sack of grain, and a platform machine would not even
notice 10 g of haldi.

Tip: Look at the pictures on page 120 and try to name each machine you have seen
in your own market.

Page 30 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q2 Ask your parents and find the amount of consumption of the following items at
your home in a month.

ITEMS WEIGHT

Atta

Rice

Pulses

Sugar

This is the table given in the book:

ITEMS WEIGHT

Atta

Rice

Pulses

Sugar

Ask at home, then write the weight of each item beside its name.
Sample answer for a family of five:

ITEMS WEIGHT USED IN ONE MONTH

Atta 20 kg

Rice 15 kg

Pulses 4 kg

Sugar 3 kg

20 kg + 15 kg + 4 kg + 3 kg = 42 kg in one month

Page 31 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Why it happens: Atta and rice are eaten at almost every meal, so they are bought in
big amounts. Sugar and pulses are used in smaller amounts, so they weigh less.

Tip: Your family’s numbers will be different. A bigger family uses more, and a smaller
family uses less. Look at the empty sacks and packets at home to check.

Q3 Taran and his sister are lifting packets of flour, rice, and salt. What do you think
they are experiencing while lifting these packets? Have you ever lifted such packets
at your home? What do you experience? Discuss.

The picture on page 120 shows: Taran and his sister carrying three sacks — one of flour, one of
rice and one of salt. Their faces show that the sacks are not easy to hold.
They are feeling that the packets are heavy. Their arms ache, they bend a little, and they can
walk only a few steps before putting the sack down.

A sack of atta is often 10 kg

A sack of rice is often 10 kg too

A salt packet is only 1 kg

So the salt packet is the easiest of the three

Sample answer: Yes, I have lifted a 5 kg atta packet at home. I could lift it with both hands, but
my arms began to hurt after a short walk. The 1 kg salt packet felt very light after that.

Why it happens: The more kilograms a packet has, the harder our muscles must
pull. That pulling is what we feel as ‘heavy’.

Tip: Always lift a heavy packet by bending your knees, not your back.

Let Us Do — Page 121

Page 32 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Lifting, packing and matching weights

Q1 Try to lift some objects around you and write the names of three objects that you
can lift easily. Estimate and write their weights.

Pick things you can hold in one hand and carry across the room.
Sample answer:

1. My geometry box — about 200 g
2. My water bottle when it is full — about 1 kg
3. A pair of slippers — about 300 g

Why it happens: Anything lighter than about 2 kg is easy for a Class 4 child to lift. A
full 1 litre water bottle is a good yardstick — it weighs about 1 kg.

Tip: To estimate, hold the object in one hand and a 1 kg salt packet in the other. If
the object feels lighter, its weight is less than 1 kg.

Q2 Now write the names of things that you can lift with a lot of effort. Estimate and
write their weights.

Now pick things that need both hands, and that you can lift only for a moment.
Sample answer:

1. A 10 kg sack of atta — about 10 kg
2. A bucket full of water — about 15 kg
3. A wooden chair — about 8 kg

Why it happens: Once a thing crosses about 5 kg, one hand is not enough. Our
arms must pull much harder, and that is what we call effort.

Tip: Never try to lift something that is too heavy for you. Ask an elder for help.

Page 33 of 59

as e
Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
How many 1 kg packets are in a. 10 kg b. 20 kg c. 50 kg d. 25 kg
e
Q3

m l as
.co a g
a
s em
aglpacket holds 1 kg, so the number of packets is simply the number of kilograms.
Each

m
.co ag
TOTAL WEIGHT WORKING NUMBER OF 1 KG PACKETS

a s ekgm
gl
a. 10 kg 1 kg ten times = 10 10

b. 20 kg
a
1 kg twenty times = 20 kg 20

co m
m.
c. 50 kg 1 kg fifty times = 50 kg 50

m as e
.co a g l
em
d. 25 kg 1 kg twenty-five times = 25 kg 25

a s
a ga.l 10 b. 20 c. 50 d. 25

om a s
. c agl
Why it happens: When each packet weighs exactly 1 kg, one packet is needed for
every kilogram. So 10 kg needs 10 m
a s e packets, 20 kg needs 20 packets, and so on.

agl
Tip: Careful — the Hindi edition asks the same question about 5 kg bags, so its
co m
answers are different.
m .
m ase
.co a g l
se m
g l a
a
se m
com g l a
m . a
ase
agl

co m
m .
m as e
.co a g l
se m
g l a
a c
m .
m a s e
em . co agl
g l as
a

co m
m .
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.co


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Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q4 Match the objects in the left column with their estimated weights in the right
column.

LEFT COLUMN RIGHT COLUMN

A cat 1 g to 5 g

An elephant 150 kg to 300 kg

A 1 litre filled bottle 3 kg to 5 kg

A tiger 10 g to 15 g

An empty gas cylinder 6 kg to 10 kg

A pen More than 1000 kg

A leaf 15 kg

A wooden chair 800 g to 1000 g

These are the two columns printed on page 121:

LEFT COLUMN RIGHT COLUMN

A cat 1 g to 5 g

An elephant 150 kg to 300 kg

A 1 litre filled bottle 3 kg to 5 kg

A tiger 10 g to 15 g

An empty gas cylinder 6 kg to 10 kg

A pen More than 1000 kg

A leaf 15 kg

A wooden chair 800 g to 1000 g

The correct matching is:

Page 35 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

OBJECT ITS ESTIMATED WEIGHT

A cat 3 kg to 5 kg

An elephant More than 1000 kg

A 1 litre filled bottle 800 g to 1000 g

A tiger 150 kg to 300 kg

An empty gas cylinder 15 kg

A pen 10 g to 15 g

A leaf 1 g to 5 g

A wooden chair 6 kg to 10 kg

Why it happens: We match by thinking of something we already know. A 1 litre
bottle of water weighs about 1000 g, a cat is about as heavy as a small school bag,
and an elephant is heavier than a car.

Tip: Notice the order of size: leaf < pen < bottle < cat < chair < gas cylinder < tiger <
elephant.

Measuring Capacity — Page 122
Litres and millilitres

Q1 Do you remember the 1 litre bottle? How much water does your water bottle hold?

Yes. A 1 litre bottle holds 1 l, which is the same as 1000 ml.
To find out how much your own bottle holds:

1. Look for a number printed near the bottom of the bottle, such as ‘1 L’ or ‘750 ml’.
2. If there is no number, fill a 250 ml glass again and again and pour it into the bottle. Count
the glassfuls.

Page 36 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

1 glass = 250 ml

2 glasses = 500 ml

3 glasses = 750 ml

4 glasses = 1000 ml = 1 l

Sample answer: My water bottle holds 750 ml. Three glasses of 250 ml filled it right up to the
top.

Why it happens: Capacity means how much a container can hold. Pouring with a
known measure is the easiest way to find it.

Q2 Find bottles and containers that can hold the following quantities of water. Write
their names in the appropriate columns in the table given below.

LESS THAN 1 LITRE 1 LITRE MORE THAN 1 LITRE

This is the table printed in the book:

LESS THAN 1 LITRE 1 LITRE MORE THAN 1 LITRE

Go around your home and school, then fill in the names. A sample:

Page 37 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

LESS THAN 1 LITRE 1 LITRE MORE THAN 1 LITRE

Tea cup (about 150 ml) School water bottle (1 l) Bucket (about 15 l)

Drinking glass (about 250 ml) Milk packet (1 l) Jug (about 2 l)

Cold drink bottle (600 ml) Oil tin (1 l) Big cooking pot (about 5 l)

Why it happens: Everything is compared with one thing — the 1 litre mark. A
container is put in the first column if it holds less than 1000 ml and in the last
column if it holds more than 1000 ml.

Tip: Most packets and bottles have their capacity printed on them. Read it before
you guess.

Q3 Take help from your teachers and parents to collect different bottles with different
capacities—500 ml, 250 ml, 100 ml, 50 ml, and 10 ml. Try to fill a one litre bottle with
the water contained in different smaller bottles.

Do the activity like this:

1. Collect clean empty bottles of 500 ml, 250 ml, 100 ml, 50 ml and 10 ml.
2. Keep a 1 litre bottle ready and empty.
3. Fill one small bottle to the brim, pour it in, and make a tally mark.
4. Go on until water reaches the top of the 1 litre bottle.

This is what you will find every time:

SMALL BOTTLE HOW MANY ARE NEEDED CHECK

500 ml 2 500 + 500 = 1000 ml

250 ml 4 250 + 250 + 250 + 250 = 1000 ml

100 ml 10 10 × 100 = 1000 ml

50 ml 20 20 × 50 = 1000 ml

10 ml 100 100 × 10 = 1000 ml

Page 38 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
Why it happens: The 1 litre bottle always takes 1000 ml. So the smaller the bottle,

m as e
l
the more times you must pour.
.co a g
a s em
gl Pour over a tray or outside. Spilled water will make your count wrong.
aTip:

co m
e m . ag
Let Us Find — Pages 123–124
g l as
Filling a 1 litre bottle a

co m
How many 500 ml bottles will fill a 1 l bottle?
em.
as
Q1

m l
m .co a g
l a se

a g
m a s
m .co agl
l a se
a g

co m
m .
m ase
.co a g l
se m
g l a
a
se m
com g l a
m . a
ase
agl
m
1 l bottle 500 ml .co
500 ml
m
a se
. com ag l
m
ase
Two 500 ml bottles being emptied into one 1 l bottle.

agl c
m .
m a s e
co agl
500 ml + 500 ml = 1000 ml

m .
1000 ml = 1 l
as e
So 500 ml = ½ l a g l

co m
m .
m ase
.co


a g l Page 39 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

2 bottles of 500 ml will fill a 1 l bottle.

Why it happens: 500 is half of 1000. Two halves make one whole, so two 500 ml
bottles make exactly 1 litre.

Tip: This is the same idea as 500 g being half of 1 kg.

Q2 How many 250 ml bottles will fill a 1 l bottle?

1 l bottle 250 ml 250 ml 250 ml 250 ml

Four 250 ml bottles beside one 1 l bottle.

250 ml + 250 ml + 250 ml + 250 ml = 1000 ml

1000 ml = 1 l

So 250 ml = ¼ l

4 bottles of 250 ml will fill a 1 l bottle.

Why it happens: 250 is a quarter of 1000. Four quarters make one whole, so four
250 ml bottles fill the 1 litre bottle exactly.

Tip: A 250 ml bottle is about one drinking glass. Four glasses of water make 1 litre.

Page 40 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q3 How many 100 ml bottles will fill a 1 l bottle?

1 l bottle 100 ml 100 ml 100 ml 100 ml 100 ml

A 100 ml bottle being poured into the 1 l bottle on page 123.

Count in hundreds till you reach 1000.

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000

1000 ml = 1 l

So 100 ml is one-tenth of 1 l

10 bottles of 100 ml will fill a 1 l bottle.

Why it happens: Ten hundreds make one thousand. So ten pourings of 100 ml fill
the litre bottle.

Tip: This matches the weight picture on page 117 — ten packets of 100 g made 1 kg.

Q4 How many 250 ml in ½ l = ______ ; 250 ml in 750 ml = ______ ; 100 ml in ½ l = ______ ; 100
ml in 800 ml = ______

First change ½ l into millilitres.

Page 41 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

1 l = 1000 ml

½ l = 500 ml

Now count each one.

QUESTION COUNTING ANSWER

250 ml in ½ l 250, 500 2

250 ml in 750 ml 250, 500, 750 3

100 ml in ½ l 100, 200, 300, 400, 500 5

100 ml in 800 ml 100, 200, 300, 400, 500, 600, 700, 800 8

2, 3, 5 and 8.

Why it happens: Each answer is just a skip-count. We keep adding the small
measure until we reach the big one, and we count how many jumps it took.

Let Us Do — Page 124
Dosing cups, droppers and everyday liquids

Q1 Find a dosing cup or a bottle of 10 ml and try to find how many 10 ml will fill a 100
ml bottle.

Count in tens up to 100:

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

That is 10 cupfuls

10 dosing cups of 10 ml will fill a 100 ml bottle.

Why it happens: Ten tens make one hundred, so ten 10 ml cupfuls make 100 ml.

Page 42 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q2 Find how many 10 ml dosing cups will fill a 250 ml glass?

10 cups = 100 ml

20 cups = 200 ml

5 cups more = 50 ml

200 ml + 50 ml = 250 ml

20 + 5 = 25 cups

25 dosing cups of 10 ml will fill a 250 ml glass.

Why it happens: 250 has 25 tens in it, and each cupful adds one ten of millilitres.

Q3 Find how many 10 ml dosing cups will fill a 500 ml vessel?

25 cups fill 250 ml

500 ml is 250 ml twice

25 + 25 = 50 cups

50 dosing cups of 10 ml will fill a 500 ml vessel.

Why it happens: Doubling the water means doubling the number of cupfuls.

Page 43 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
Find how many 10 ml dosing cups will fill a 1 l bottle?
e
Q4

m l as
m .co a g
a se

a g l
1 l = 1000 ml

co m
50 cups fill 500 ml
e m . ag
g l as
a
1000 ml is 500 ml twice

50 + 50 = 100 cups

co m
em.
m as
100 dosing cups of 10 ml will fill a 1 l bottle.

.co a g l
a s emit happens: 1000 has 100 tens in it, so 100 cupfuls of 10 ml make 1 litre.
gl
Why
a
m a s
.co agl
Tip: Doing this for real takes a long time. Try 10 cupfuls, mark the level, and then
work out the rest.
se m
g l a
a

co m
.
Q5 Take a 1 ml dropper and find out how many 1 ml droppers will fill a 10 ml dosing

e m
as
cup?
m l
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a s em
gl

a
se m
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10

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m
ase
That is 10 droppers

a gl
10 droppers of 1 ml will fill a 10 ml dosing cup.

co m
m .
e
Why it happens: Ten ones make one ten, so ten 1 ml droppers make 10 ml.
m l as
m .co a g
l a se
ag
.c
s e m
m a
e m . co agl
g l as
a

co m
m .
m ase
.co


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Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q6 How many droppers will fill a teaspoon?

A teaspoon holds about 5 ml

1 + 1 + 1 + 1 + 1 = 5 ml

That is 5 droppers

About 5 droppers of 1 ml will fill one teaspoon.

Why it happens: A teaspoon is a small measure of about 5 ml, so five 1 ml droppers
just fill it.

Tip: Check it with your own spoon. Spoons are not all the same size, so your answer
may be 4 or 6.

Q7 Find out how much of these liquids are used at a time. a) Eye drops — Less than 1 ml
at a time. b) Honey c) Cough Syrup d) Cooking Oil e) ____________

The pictures beside this question show: an eye-drop bottle, a jar of honey with a spoon, a
cough syrup bottle with a spoon, and a bottle of cooking oil.
The book has already filled in (a) for you. Here are the rest:

LIQUID HOW MUCH IS USED AT A TIME

a) Eye drops Less than 1 ml at a time (about 1 drop)

b) Honey About 5 ml — one teaspoon

c) Cough Syrup About 5 ml to 10 ml — one or two teaspoons

d) Cooking Oil About 15 ml to 30 ml — one or two tablespoons

e) Milk (your own choice) About 200 ml — one glass

Page 45 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Why it happens: Strong things like medicine are used in very small amounts, so we
measure them in millilitres. Things we drink or cook with are used in bigger
amounts.

Tip: In part (e) you may write any liquid you like, such as milk, tea, buttermilk or
shampoo. Just write how much of it is used at one time.

Let Us Do — Page 125
Mr Krishna’s perfumed oil

Q1 Mr Krishna packages perfumed oils in different sized bottles. During a festival, the
following customers asked for 1 l perfumed oils but in different sized bottles. Write
the number of bottles each of them will get. a) Ms Shetty wants bottles of 500 ml
each b) Mr Muthukumar wants bottles of 200 ml each c) Ms Naini wants bottles of
100 ml each d) Ms Kannan wants bottles of 50 ml each

Every customer gets 1 l, and 1 l = 1000 ml. So each time we ask: how many of these small
bottles make 1000 ml?

CUSTOMER BOTTLE COUNTING BOTTLES
SIZE

a) Ms Shetty 500 ml 500, 1000 2

b) Mr 200 ml 200, 400, 600, 800, 1000 5
Muthukumar

c) Ms Naini 100 ml 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 10

d) Ms Kannan 50 ml two 50 ml make 100 ml, and 1000 ml has ten 100 20
ml → 10 × 2

a) 2 b) 5 c) 10 d) 20

Why it happens: The oil is the same 1000 ml every time. Smaller bottles hold less, so
more bottles are needed to hold the same oil.

Page 46 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Tip: Check each answer by adding back: 5 × 200 ml = 1000 ml, 20 × 50 ml = 1000 ml.

Q2 Estimate and verify by measuring. Use the bottles you have collected for this
purpose (for example, 500 ml, 250 ml, 100 ml, 50 ml, and 10 ml).

CONTAINER ESTIMATE ACTUAL CAPACITY

Water bottle

Glass

Mug

Jug

Bucket

Teaspoon

Bowl

This is the table printed in the book:

CONTAINER ESTIMATE ACTUAL CAPACITY

Water bottle

Glass

Mug

Jug

Bucket

Teaspoon

Bowl

First write your guess in the ‘Estimate’ column. Then fill the container with a measuring bottle
and write the real answer.
Sample answer (your containers may be bigger or smaller):

Page 47 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

CONTAINER ESTIMATE ACTUAL CAPACITY

Water bottle 1l 1l

Glass 200 ml 250 ml

Mug 250 ml 300 ml

Jug 2l 2l

Bucket 10 l 15 l

Teaspoon 5 ml 5 ml

Bowl 250 ml 200 ml

Why it happens: Estimating first and measuring afterwards trains the eye. Soon you
will be able to look at a mug and say ‘about 300 ml’ without pouring at all.

Tip: The last two rows in the book’s table are empty. Add two containers of your own
choice, such as a lota or a lunch-box.

Let Us Explore — Pages 125–126
Items sold in fixed quantities

Q1 Visit nearby shops and make a list of different items that are sold in the following
quantities.

50 ML 100 ML 200 ML 250 ML 500 ML 900 ML

This is the table given on page 126:

Page 48 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

co m
m.
50 ML 100 ML 200 ML 250 ML 500 ML 900 ML

m as e
.co a g l
se m
g l a
a

co m
m . ag
l a se
g each packet, and write the item under the right heading.
Walk around a shop, read the labelaon
A sample list:

. c om
500 ML em
a s
com
50 ML 100 ML 200 ML 250 ML 900 ML

m . agl
ase
Hair oil Curd cup Milk packet Milk packet Cold drink Shampoo

aglEye drops box Buttermilk Juice tetra pack Curd packet Mustard oil Floor cleaner

m a s
.co agl
Rose water Lassi glass Cold drink Ice cream tub Water bottle Phenyl

se m
Perfume Coconut oil
g l a
Juice bottle Buttermilk Ghee tin Hand wash
a
Why it happens: Shops sell liquids in fixed sizes so that the price is easy to fix and
co m
m .
the packets stack neatly. That is why the same numbers — 50, 100, 200, 250, 500 —
m as e
.co
come again and again.
a g l
se m
g l a
a Tip: 900 ml is an odd size. Look for it on shampoo, floor cleaner and some oil bottles.

se m
com g l a
m . a
Let Us Find — Page 126 gl ase
a
Water we drink and water we use

. com
m a s
How many litres of water do you drink in a day? How did youemfind out?
co gl
Q1

. a
a sem
agl

.c
m
Count your glasses, then change them into litres.

a s e
. c om
1. Take one glass and see how much it holds. A usual glass holds 250 ml.
agl
s e m drink a glass through the day.
2. Keep a tally mark every time you
a
3. Add up at night.
agl

co m
m .
m ase
.co


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Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

1 glass = 250 ml

4 glasses = 250 + 250 + 250 + 250 = 1000 ml = 1 l

8 glasses = 1 l + 1 l = 2 l

Sample answer: I drank 8 glasses in a day, so I drank about 2 litres of water. I found out by
counting my glasses and knowing that 4 glasses make 1 litre.

Why it happens: Counting glasses is easier than measuring straight into litres, and
4 glasses of 250 ml always make exactly 1 litre.

Tip: A Class 4 child should drink about 1½ to 2 litres of water each day, and more on
a hot day.

Q2 How much water can a crow drink at a time?

A crow is a small bird, so it drinks a very small amount.

A crow’s beak takes in only a few drops at one dip

About 10 drops make 1 ml

A crow drinks about 5 ml to 10 ml at a time

So a crow drinks about 5 ml to 10 ml at a time — only one or two teaspoonfuls.

Why it happens: A living thing drinks in proportion to its size. A crow is tiny beside
us, so it needs only a spoonful where we need a glassful.

Tip: This is why a small bowl of water on your terrace is enough for many birds in
summer. Put one out and keep it filled.

Page 50 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q3 How much milk do you drink in one day?

Count your cups or glasses of milk.

1 small glass of milk = about 200 ml

Morning 200 ml + night 200 ml = 400 ml

Sample answer: I drink one glass in the morning and one at night. That is 200 ml + 200 ml =
400 ml of milk in a day, a little less than half a litre.

Why it happens: Milk is measured just like water, in millilitres and litres. A packet of
milk from the shop is usually 500 ml or 1 l.

Tip: Children should drink about 400 ml to 500 ml of milk a day. Curd and paneer
count too.

Q4 How much water does an elephant drink in a day?

An elephant is the biggest animal on land, so it drinks a very large amount.

A big bucket holds about 15 l

An elephant drinks about 100 l to 150 l in a day

That is about 8 to 10 bucketfuls

An elephant drinks about 100 to 150 litres of water in one day.

Why it happens: A body as huge as an elephant’s needs a huge amount of water to
keep working. We drink about 2 l a day, and an elephant drinks about fifty times
more.

Page 51 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Tip: The Hindi edition asks this question about a cow. A cow drinks about 40 to 50
litres of water in a day.

Q5 What do you use the most water for? What do you use the least water for? Compare
this with a few others in your grade. In which activities is your water usage the
same?

Make a list of everything you use water for, and think how much each one takes.

ACTIVITY ABOUT HOW MUCH WATER MOST OR LEAST?

Washing clothes About 60 l Most

Bathing About 40 l A lot

Washing utensils About 20 l Medium

Watering plants About 10 l Medium

Drinking About 2 l Least

Brushing teeth About 1 l Least

Sample answer: I use the most water for washing clothes and bathing. I use the least water
for brushing my teeth. When I asked my friends, the amounts for drinking and brushing teeth
were almost the same for all of us. Bathing was different, because some of us use a bucket and
some use a shower.

Why it happens: The jobs that clean something big take the most water. Drinking
and brushing use very little, so they are nearly the same for everybody.

Tip: Close the tap while brushing. That one small habit saves about 5 litres a day.

Page 52 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q6 How much water may be used in the following activities? a. Water for taking a
shower b. Watering crops in a field c. Watering flowering plants d. Washing clothes
e. ____________ f. ____________

Some jobs take a bucket, and some take thousands of litres.

ACTIVITY ABOUT HOW MUCH WATER

a. Water for taking a shower About 40 l with a shower; only about 20 l with a bucket

b. Watering crops in a field Thousands of litres — a whole canal or tubewell

c. Watering flowering plants About 5 l to 10 l — one small bucket

d. Washing clothes About 60 l for one family wash

e. Washing utensils (your own choice) About 20 l

f. Mopping the floor (your own choice) About 10 l

Why it happens: The bigger the thing we are wetting, the more water it needs. A
field is far bigger than a flower pot, so it needs far more water.

Tip: Bathing with a bucket instead of a shower saves about 20 litres each time.

Containers Used for Measuring Capacity — Page 127

Page 53 of 59

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Class 4 Maths Chapter 8 Weigh It, Pour It
a g l AglaSem · NCERT Solutions

Milk measuring cans
co m
em.
m l as
Q1
.co
Have you seen these measuring cans for measuring milk?
m a g
l a se
a g

co m
e m . ag
g l as
a
50 ml 100 ml 200 ml 500 ml 1000 ml
co m
e m.
m l as
.co
The five milk measuring cans printed on page 127.

a g
se m
g l a
a ANSWER
m a s
m .co agl
l a se
a g

co m
m .
m as e
.co a g l
se m
g l a
a
se m
200.cmlom g l a
50 ml 100 ml
m 500 ml 1000 ml a
l a se
agfive milk measuring cans printed on page 127.
The

co m
Yes. The milkman uses these five cans to measure milk quickly.
m .
m ase
.co a g l
se m
g l a
a c
m .
m a s e
e m . co agl
g l as
a

co m
m .
m as e
.co


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Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

CAN HOW MANY MAKE 1 LITRE

50 ml 20

100 ml 10

200 ml 5

500 ml 2

1000 ml 1 (it is 1 litre itself)

1000 ml = 1 l

500 ml + 500 ml = 1000 ml

200 + 200 + 200 + 200 + 200 = 1000 ml

Why it happens: The cans are made in sizes that fit neatly into a litre. So the
milkman never has to guess — he just dips the right can once or twice.

Tip: If a customer asks for 700 ml, the milkman can use one 500 ml can and one 200
ml can.

Water Conservation in Everyday Life — Page 127
A dripping tap

Q1 Have you ever noticed a small drip of water flowing from your tap or water purifier?
Have you considered how much water is actually being wasted?

Yes, a slow drip is easy to miss, but it never stops.

About 10 drops make 1 ml

A slow tap drips about 40 times in a minute

In one minute it wastes about 4 ml

Page 55 of 59

Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

A single drip looks like nothing, but it goes on all day and all night. Even a slow drip wastes
several litres every day.

Why it happens: A drop is tiny, but the drops never stop coming. Many small
amounts added again and again make a big amount.

Tip: Tell an elder as soon as you see a dripping tap. A new washer costs very little
and saves a lot of water.

Q2 Take a container and put it under the leaking tap or water purifier for an hour. How
much water is lost in an hour from just a slow drip? Did it surprise you?

Do the activity like this:

1. Put an empty measuring bottle under the dripping tap.
2. Note the time and leave it for exactly one hour.
3. Read the level on the bottle.

Sample answer: My bottle had water up to the 250 ml mark after one hour.

Water lost in 1 hour = 250 ml

That is one full drinking glass, from a tap that was not even open!

Yes, it is surprising. A tap nobody is using can still fill a glass every hour.

Why it happens: The drops keep adding up. In one hour there are 60 minutes, and
every minute sends a few more millilitres into the bottle.

Tip: Your own answer may be more or less than 250 ml. Write down what your bottle
really shows.

Q3 How much water is lost in a day?

One hour wasted 250 ml. A day has 24 hours.

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Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

1 hour = 250 ml

4 hours = 250 + 250 + 250 + 250 = 1000 ml = 1 l

24 hours = 4 hours, six times

So 1 day = 1 l six times = 6 l

About 6 litres of water is lost in one day from just one slow drip.

Why it happens: Four hours fill one litre, and there are six fours in twenty-four. So
the day wastes six litres.

Tip: 6 litres is about half a bucket. That much clean water is thrown away every day
by one tap that nobody has fixed.

Q4 How much do you think is lost in a week?

A week has 7 days, and each day wastes about 6 l.

6l+6l+6l+6l+6l+6l+6l

6, 12, 18, 24, 30, 36, 42

So one week = 42 l

About 42 litres of water is lost in one week.

Why it happens: The same 6 litres is lost every day, so we add 6 seven times — once
for each day of the week.

Tip: 42 litres is nearly three full buckets. One family could bathe with that water.

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Class 4 Maths Chapter 8 Weigh It, Pour It AglaSem · NCERT Solutions

Q5 How would this wastage of water affect us?

Wasted water hurts everyone, not just the person whose tap is dripping.

Wells, ponds and tanks go dry sooner, so there is less water for everyone.
Water has to be pumped and cleaned before it reaches our tap. Wasting it wastes that work
and that electricity too.
Farmers get less water for their crops, so less food grows.
Animals and birds find less water to drink.
In summer, taps may run only for an hour a day.

One tap wastes 42 l in a week

10 such taps waste 42 × 10 = 420 l in a week

Why it happens: Only a small part of the water on Earth is clean water we can drink.
Once it is wasted we cannot make more of it.

Tip: Three easy habits: close the tap while brushing, bathe with a bucket, and get
every dripping tap repaired.

Chapter at a glance
Heavy things are weighed in kilograms (kg) and light things in grams (g). 1 kg = 1000 g.
On a pan balance the heavier pan goes down and the lighter pan goes up. Equal weights
keep it level.
500 g is half of 1 kg, 250 g is one-fourth of 1 kg, and ten packets of 100 g make 1 kg.
How much a container holds is its capacity. We measure it in litres (l) and millilitres (ml). 1 l =
1000 ml.
Two 500 ml, four 250 ml, ten 100 ml or a hundred 10 ml bottles each fill one 1 l bottle.
Milk is measured with cans of 50, 100, 200, 500 and 1000 ml. Even one slow drip from a tap
wastes litres of water.

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