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AddITIon And SuBTrACTIon oF LengTh

example 1. Add:
a. 20 m 76 cm and 8 m 35 cm b. 8 km 975 m and 6 km 687 m

Solution. Arrange the given measures in the appropriate columns and then add

columnwise.
a. m cm

1 1
2 0 7 6 20 m 76 cm + 8 m 35 cm = 29 m 11 cm

+ 8 3 5

2 9 1 1

b. km m

1 1
1
8 9 7 5 8 km 975 m + 6 km 687 m = 15 km 662 m
+ 6 6 8 7

1 5 6 6 2

example 2. Subtract:
a. 9 m 76 cm from 16 m 25 cm

b. 16 km 245 m from 20 km 120 m

Solution. Arrange the given measures in columns correctly and then subtract

columnwise.
a. m cm

15 11 15
1 6 2 5 16 m 25 cm – 9 m 76 cm = 6 m 49 cm

– 9 7 6
6 4 9

b. km m

1 9 10 11 10
2 0 1 2 0 20 km 120 m – 16 km 245 m = 3 km 875 m
– 1 6 2 4 5
3 8 7 5

154 Mathematics 4