NCERT Book Class 7 Mathematics (Part I) Chapter 3 A Peek Beyond the Point

3 A PEEK BEYOND
THE POINT

3.1 The Need for Smaller Units
Sonu’s mother was fixing a
toy. She was trying to join
two pieces with the help of
a screw. Sonu was
watching his mother with
great curiosity. His mother
was unable to join the
pieces. Sonu asked why.
His mother said that the
screw was not of the
right size.
She brought another screw from the box and was able to fix the toy.
The two screws looked the same to Sonu. But when he observed them
closely, he saw they were of slightly different lengths.
Sonu was fascinated
by how such a small
difference in lengths
could matter so much.
He was curious to
know the difference
in lengths. He was also
curious to know how
little the difference
was because the
screws looked nearly
the same.
In the following figure, screws are placed above a scale. Measure
them and write their length in the space provided.