Page 165 - ICSE Math 5

Let’s understand these through examples.
Example 11: Multiply 38 kg 500 g by 24.

Solution: Express the given measure in 3 8 . 5
kilograms using decimal notation. × 2 4 Remember

38 kg 500 g = 38.5 kg 1 5 4 0 To multiply or divide,
first convert the given
Now multiply 38.5 kg by 24. + 7 7 0 0 measure in decimals.

So, the product obtained is 924 kg. 9 2 4 . 0
Example 12: Divide 98 kL 928 L by 54 and express the answer in litres.

Solution: Step 1: Express the given measure in kilolitres using decimal 1 . 8 3 2
notation. 54 9 8 . 9 2 8

98 kL 928 L = 98.928 kL. – 5 4
4 4 9
Step 2: Divide 98.928 kL by 54.
– 4 3 2
Step 3: Divide like whole numbers.
1 7 2
Step 4: Place the decimal point of the quotient just above – 1 6 2
the decimal point of the dividend while dividing. 1 0 8

So, the quotient obtained is 1.832 kL. 1 0 8

To express the answer in litres, convert 1.832 kL to litres. 0
1.832 kL = 1.832 × 1,000 L = 1,832 L ( 1 kL = 1,000 L)

So, 1.832 kL can be expressed as 1,832 L.

Exercise 11.4

1. Express the following measures in decimal form and then add.
(a) 24 g 175 mg, 16 g 2 cg 8 mg and 6 mg

(b) 9 L 125 mL, 6 L 4 mL and 8 mL

(c) 96 m 25 cm, 16 m 7 cm and 2 m 14 cm
(d) 15 kg 125 g, 29 kg 8 g and 36 kg 769 g
(e) 16 kg 7 hg 4 dag 5 g, 8 hg 2 g, 4 kg 2 hg 3 g and 9 kg

(f) 5 L 6 dL 8 cL 1 mL, 8 L 9 dL 2 cL 4 mL and 7 L 3dL 8 cL

2. Express the following measures in decimal form and then subtract.

(a) 28 km 256 m from 80 km 90 m (b) 57 kg 245 g from 104 kg 3 g
(c) 153 kL 76 L from 796 kL 451 L (d) 592 m 30 cm from 919 m 42 cm

(e) 11 cm 9 mm from 97 cm 8 mm (f) 41 g 108 mg from 72 g 800 mg

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