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NCERT Solutions for Class 4th Maths Chapter 6 Metre and Centimetres — Let Us Explore

Book page 90 to 91 Updated on2026-09-19

Q1.
Activity: Students will measure their height using a measuring tape. Make a table in your notebook and complete it.
Answer

How to do it:

  1. Stick the measuring tape on a wall with the 0 mark touching the floor.
  2. One child stands straight against the wall, heels together, looking ahead.
  3. A friend puts a ruler flat on the child's head and reads the mark on the tape.
  4. Write that number in the Height in cm column.
  5. For the last column, split the number after the hundreds: 132 cm = 1 m 32 cm.

Sample answer (your class will have its own names and numbers):

Name of the StudentHeight in cmHeight in m
Aarav132 cm1 m 32 cm
Bhavya128 cm1 m 28 cm
Chetan141 cm1 m 41 cm
Divya98 cmless than 1 m
Eshan125 cm1 m 25 cm
Why it happens: 100 cm make one metre. So the hundreds in the number tell us the metres, and whatever is left over stays as centimetres.
Tip: Everybody must take off their shoes and stand on the same flat floor, or the heights cannot be compared fairly.
Q2.
Height of the tallest child is _____.
Answer

Look down the Height in cm column of your table and pick the biggest number.

Name of the StudentHeight in cmHeight in m
Aarav132 cm1 m 32 cm
Bhavya128 cm1 m 28 cm
Chetan141 cm1 m 41 cm
Divya98 cmless than 1 m
Eshan125 cm1 m 25 cm
98, 125, 128, 132, 141
The biggest number is 141
141 cm = 100 + 41 = 1 m 41 cm

Sample answer: The tallest child is Chetan. His height is 141 cm, that is 1 m 41 cm.

Why it happens: All the heights are written in the same unit, centimetres. So the biggest number belongs to the tallest child.
Q3.
Height of the shortest child is _____.
Answer

Now pick the smallest number in the same column.

Name of the StudentHeight in cmHeight in m
Aarav132 cm1 m 32 cm
Bhavya128 cm1 m 28 cm
Chetan141 cm1 m 41 cm
Divya98 cmless than 1 m
Eshan125 cm1 m 25 cm
98, 125, 128, 132, 141
The smallest number is 98
98 cm is less than 100 cm, so it is less than 1 m

Sample answer: The shortest child is Divya. Her height is 98 cm.

Why it happens: 98 has only two digits and every other height has three, so 98 is the smallest without any counting.
Q4.
Number of children who are more than 1 m tall _____.
Answer

1 m = 100 cm. So we count the heights that are more than 100.

Name of the StudentHeight in cmHeight in m
Aarav132 cm1 m 32 cm
Bhavya128 cm1 m 28 cm
Chetan141 cm1 m 41 cm
Divya98 cmless than 1 m
Eshan125 cm1 m 25 cm
132 → more than 100 ✔
128 → more than 100 ✔
141 → more than 100 ✔
98 → less than 100 ✘
125 → more than 100 ✔
Count the ticks: 1, 2, 3, 4

Sample answer: 4 children are more than 1 m tall.

Why it happens: Comparing with 1 m is easy once every height is in centimetres, because 1 m is simply 100 cm.
Q5.
Number of children who are shorter than 1 m _____.
Answer

Count the heights that are less than 100 cm.

Name of the StudentHeight in cmHeight in m
Aarav132 cm1 m 32 cm
Bhavya128 cm1 m 28 cm
Chetan141 cm1 m 41 cm
Divya98 cmless than 1 m
Eshan125 cm1 m 25 cm
Only 98 cm is less than 100 cm
So the count is 1

Check: 4 children taller than 1 m + 1 child shorter than 1 m = 5 children in the table ✔

Sample answer: 1 child is shorter than 1 m.

Why it happens: Every child is either taller or shorter than 1 m, so the two counts must add up to the number of children in the table.
Tip: In most Class 4 rooms this answer is 0, because nearly everyone has already crossed one metre. Use your own table, not ours.
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