Page 135 - Revised Maths Wisdom Class - 3

Length 133

Example 3: Add 4 km 50 m and 2 km 387 m.
km m
Solution: Arrange the given lengths in km and m columns. 1

4 km 50 m + 2 km 387 m 4 0 5 0

= 6 km 437 m + 2 3 8 7
6 4 3 7

Exercise 10B

1 Add the following.
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(a) m cm (b) m cm (c) m cm
3 5 0 7 1 6 3 5 4 8 9 5
+ 5 3 1 9 + 2 9 5 3 + 1 9 3 2

(d) km m (e) km m (f) km m
4 1 2 5 8 0 1 0 5 2 0 0
+ 7 2 0 0 + 9 1 2 5 + 7 1 2 7

2 Arrange in columns and add.

(a) 107 m 65 cm and 80 m 45 cm.

(b) 87 m 65 cm, 9 m 15 cm and 24 m 25 cm.

(c) 30 m 25 cm, 40 m 65 cm and 192 m 20 cm.

(d) 24 km 350 m and 9 km 175 m.

(e) 8 km 100 m, 15 km 275 m and 7 km 374 m.

(f) 54 km 74 m and 136 km 299 m.

Subtraction of Lengths

To subtract, we arrange the given lengths in columns of ‘m’ and ‘cm’ or ‘km‘ and ‘m‘ and
then subtract separately.