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Example 3: Check whether the following numbers are multiples of 13.

(a) 147 (b) 221
Solution: (a) By using division, we get (b) By using division, we get

11 17
13 147 13 221
– 13 – 13
17 91
– 13 – 91
4 0

147 ÷ 13 = 11 R 4 221 ÷ 13 = 17 R 0
Since, 147 is not exactly divisible Since, 221 is exactly divisible by 13, so
by 13, so 147 is not a multiple of 13. 221 is a multiple of 13.

Practice Time 5A

1. Write all the factors of the following numbers.
(a) 18 (b) 40

(c) 84 (d) 135
2. Write the first five multiples of each of the following numbers.

(a) 10 (b) 13
(c) 19 (d) 27
3. Match the following:

Column A Column B
(a) Multiples of 18 (i) 24
(b) A factor of 42 (ii) 36, 54, 90

(c) All the factors of 46 (iii) 30
(d) The greatest factor of 30 (iv) 7

(e) The smallest multiple of 24 (v) 1, 2, 23, 46

4. Write the multiples of 4 between 32 and 60.

5. Think about the factors of the numbers whose sum and difference are given below.

17 10
+ +
× ×
(a) 60 (b) 24

× ×

– –
17 10

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