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E:\Working\Brother_Education\Preparatory_Stage_Maths-4\Open_Files\Chap-10
\\November 1, 2023 4:57 PM Bharat Arora P-1 Reader _________________________ Date: ___________________74

Solution: (a) m cm mm (b) km m cm

17 11 9 10 11 9
7 1 15 2 10 0 1 10 15

1 8 2 5 9 3 0 1 2 0 5 0
– 9 7 6 4 – 1 6 2 4 5 9 0
8 4 9 5 1 3 8 7 4 6 0

Thus, 18 m 25 cm 9 mm – 9 m Thus, 30 km 120 m 50 cm – 16 km
76 cm 4 mm = 8 m 49 cm 5 mm 245 m 90 cm = 13 km 874 m 60 cm

Example 3: Rohan travelled 218 km 352 m by car and 414 km 165 m by bus. Find
the total distance travelled by Rohan.
Solution: km m

1 1
Distance travelled by car = 2 1 8 3 5 2
Distance travelled by bus = + 4 1 4 1 6 5

Total distance travelled = 6 3 2 5 1 7
Thus, Rohan travelled 632 km 517 m in all.

Example 4: A tree was 21 m 75 cm high. It broke from the top at 12 m 24 cm
height, due to a storm. How much of the tree is still standing erect?
Solution: m cm

1 11
Height of the tree before breaking = 2 1 7 5
Height of the broken part of the tree = – 1 2 2 4

Height of the remaining part of the tree = 9 5 1
Thus, 9 m 51 cm of the tree is still standing erect.

Think and Answer

What is the difference between the distance of your school and your father's office
from home?

Practice time 10b

1. Add the following:

(a) km m cm (b) m cm mm (c) km m cm mm

2 4 1 7 5 4 2 2 1 3 3 8 6 1 8 2 1 8 4 3 2
1 3 1 0 4 5 3 1 4 1 4 3 5 2 4 1 4 8 3 7 5
+ 0 5 0 8 1 0 9 + 1 2 0 9 1 7 + 3 4 2 3 3 7 2 2

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