NCERT Solutions for Class 5th Maths Chapter 5 Drawing lines of a given length with a scale — Let Us Draw
Book page 62 Updated on2026-09-19
Q1.
Draw lines of the following lengths in your notebook using a scale. 1. 5 cm 5 mm 2. 3 cm 6 mm 3. 8 cm 3 mm 4. 36 mm 5. 67 mm
Answer
Draw each one like this.
Put the ruler flat on the page. Make a small dot at the 0 mark.
Find the finish point. Go to the centimetre number first, then count the small marks after it.
Make a second dot there.
Join the two dots along the edge of the ruler, in one clean stroke.
Write the length under the line.
Line
Where the second dot goes
Same length in mm
5 cm 5 mm
past 5, then 5 small marks more
55 mm
3 cm 6 mm
past 3, then 6 small marks more
36 mm
8 cm 3 mm
past 8, then 3 small marks more
83 mm
36 mm
same as 3 cm 6 mm
36 mm
67 mm
same as 6 cm 7 mm
67 mm
The five lines drawn to the same scale. Notice that lines 2 and 4 are exactly the same length.
Did you spot it? Line 2 and line 4 are the same line. 3 cm 6 mm and 36 mm are two names for one length.
Q2.
How did you draw lines of lengths 36 mm and 67 mm? Share your thoughts in class.
Answer
Change the millimetres into centimetres and millimetres first. Your ruler has big numbers for centimetres, so it is much easier to find 3 cm 6 mm than to count 36 tiny marks one by one.
Look at the mm number. 36 mm.
Split off the tens. 36 = 30 + 6.
Change the tens into centimetres. 30 mm = 3 cm, because 10 mm make 1 cm.
So 36 mm = 3 cm 6 mm. Go to the 3 on your ruler, then count 6 small marks more.
36 mm = 30 mm + 6 mm = 3 cm 6 mm 67 mm = 60 mm + 7 mm = 6 cm 7 mm
Sample answer for the class discussion: "I did not count 36 small marks, because I would lose count. I saw that 36 mm has 3 tens in it, and every ten millimetres is one centimetre. So I went straight to the 3 cm mark and then counted only 6 small marks. For 67 mm I went to 6 cm and counted 7 small marks."
Why splitting the number works: The tens digit of a millimetre number is the number of whole centimetres, and the ones digit is the millimetres left over. This is the same idea as reading 36 as 3 tens and 6 ones.