Page 125 - Math Skill - 5

Measurement 123

Basic Operations on Length, Mass (Weight) and Capacity
The basic operations we perform on the measures of length, mass (weight) and capacity are:
Addition, Subtraction, Multiplication and Division.

Let’s learn through examples.

Let’s Attempt

Example 1: Add the following.

(a) 6 kg 675 g, 9 kg 85 g and 10 kg 9 g (b) 7 m 60 cm, 3 m 7 cm and 90 cm
(c) 5 L 200 mL, 3 L 30 mL and 6 mL

Solution: (a) Adding column-wise, we get: (b) Adding column-wise, we get:
kg g m cm
6 6 7 5 1

9 0 8 5 7 6 0
+ 1 0 0 0 9 3 0 7
2 5 7 6 9 + 0 9 0
1 1 5 7
Thus, required sum = 25 kg 769 g
Thus, required sum = 11 m 57 cm

(c) Adding column-wise, we get:
L mL
5 2 0 0
3 0 3 0
+ 0 0 0 6
8 2 3 6 Thus, required sum = 8 L 236 mL

Example 2: Subtract the following.

(a) 89 L 678 mL from 103 L 250 mL (b) 7 kg 865 g from 10 kg
(c) 9 km 75 m from 16 km 20 m

Solution: (a) Subtracting column-wise we get: (b) Subtracting column-wise we get:

L mL kg g
1 0 3 2 5 0 1 0 0 0 0
– 8 9 6 7 8 – 7 8 6 5

1 3 5 7 2 2 1 3 5
Thus, required difference = 13 L 572 mL Thus, required difference

= 2 kg 135 g
(c) Subtracting column-wise we get:
km m
1 6 0 2 0
– 9 0 7 5
6 9 4 5 Thus, required difference = 6 km 945 m