Page 83 - Start Up Mathematics_5

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Example 3: What is of 720 g?
8 90
3 3 3 × 720
Solution: of 720 g = × 720 = = 3 × 90 = 270
8 8 8 1
3
So, of 720 g = 270 g.
8
1
Example 4: What is of ` 20?
5
1 1 1 × 20 20
Solution: of ` 20 = × 20 = = = 4
5 5 5 5
1
So, of ` 20 = ` 4.
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EXERCISE 5.1

1. Multiply.
3 2 4 7 2
(a) × 7 (b) × 4 (c) × 6 (d) × 8 (e) × 9
5 7 9 12 5

1 9 5 6 7
(f) × 5 (g) × 11 (h) × 3 (i) × 7 (j) × 2
3 20 11 24 9
13 1 2 13 9
(k) × 10 (l) × 14 (m) × 5 (n) × 5 (o) 12 ×
30 8 15 35 30
2. Fill in the blanks.

4 1
(a) of ` 30 = ` ________ (b) of 400 g = ________ g
5 8
1 2
(c) of 5 kg = ________ kg (d) of 9 km = ________ km
4 3
5 2
(e) of 8 km = ________ m (f) of 27 L = ________ L
6 9
5 3
(g) of ` 21 = ` ________ (h) of 33 L = ________ mL
8 11
Multiplication of Two Fractions

Follow these steps to multiply two fractions.

Step 1: Multiply the numerators of the two fractions and write as the numerator of the
product.

Step 2: Multiply the denominators of the two fractions and write as the denominator of the
product.
Step 3: Simplify or reduce the fraction to the lowest term if required. In case of an improper
fraction, change to mixed fraction.

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