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ADDITION AND SUBTRACTION OF LENGTHS

Addition of Lengths

To add two or more lengths in metres or centimetres, we simply add the numbers

and write down the unit.
Example 1: Add the following.

(a) 75 m + 18 m (b) 86 cm + 57 cm (c) 79 m + 26 m + 85 m

Solution: (a) 1 (b) 1 1 (c) 2

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

Subtraction of Lengths

To subtract the given lengths, we simply subtract the smaller length (number) from
the bigger length (number) and write down the unit.

Example 2: Subtract the following.

(a) 81 m – 38 m (b) 72 cm – 58 cm (c) 163 cm – 95 cm
Solution: (a) 7 11 (b) 6 12 (c) 15

8 1 m 7 2 cm 0 5 13
– 3 8 m – 5 8 cm 1 6 3 cm

4 3 m 1 4 cm – 9 5 cm
6 8 cm

Practice Time 9B

1. Add the following.
(a) 5 9 cm (b) 5 6 cm (c) 8 2 m (d) m cm

+ 3 3 cm 2 8 cm 4 5 m 5 6 3
+ 2 0 cm + 1 1 m + 4 2 7

2. Subtract the following:

(a) 7 3 cm (b) 8 7 cm (c) 4 9 5 m (d) m cm

– 5 0 cm – 6 8 cm – 1 3 6 m 9 6 2
– 2 8 6

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