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Example 2. Subtract 18 kg 25 g from 27 kg.
Solution. We can subtract weights in the same way as we subtract lengths.

Method 1 Method 2
Put zeros if
kg g there is no 2 7 0 0 0 g
2 7 0 0 0 value in grams. - 1 8 0 2 5 g
- 1 8 0 2 5 8 9 7 5 g
8 9 7 5

Thus, the answer is 8 kg 975 g or 8975 g.
Example 3. Multiply 12 kg 250 g by 24. Express the answer in kg.

Solution. 12 kg 250 g × 24 = 12 kg × 24 + 250 g × 24

= 288 kg + 6000 g
= 288 kg + 6 kg = 294 kg

Thus, the answer is 294 kg.

Example 4. Divide 120 kg 580 g by 10. Express the answer in kg and g.
Solution. 120 kg 580 g ÷ 10

= (120 ÷ 10) kg + (580 ÷ 10) g
= 12 kg + 58 g

= 12 kg 58 g

Thus, the answer is 12 kg 58 g.

Exercise 7D

1. find the sum.
a. 24 kg 345 g, 7 kg 110 g and 2 kg 45 g

b. 18 g 250 mg, 10 g 57 mg and 6 g 589 mg

2. Subtract:
a. 4 kg 309 g from 15 kg 370 g b. 55 g 312 mg from 109 g 379 mg

3. Multiply the following:

a. 16 g 50 mg by 30 b. 42 kg 395 g by 10
4. Divide:

a. 5109 g by 3 b. 350 g 60 mg by 20 c. 65 kg 700 g by 9

178 Mathematics 5