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Exercise 3A

1. Find the first five multiples of:

a. 13 b. 18 c. 24 d. 75 e. 115
2. Find:

a. the 8th multiple of 125. b. the 10th multiple of 38.
c. the 12th multiple of 100. d. the first five even multiples of 3.
e. the first five odd multiples of 11.

3. Find the multiples of:
a. 19 which are less than 200. b. 15 that are between 100 and 220.
c. 17 between 140 and 160. d. 25 which are 2-digit numbers.
4. Say Yes or No with a reason.

a. Is 135 a multiple of 8? b. Is 240 a multiple of 16?
c. Is 486 a multiple of 9? d. Is 2448 a multiple of 12?

5. using multiplication, find all the factors of:
a. 28 b. 40 c. 72 d. 54 e. 120
6. using division, find all the factors of:

a. 45 b. 81 c. 124 d. 200 e. 345
7. Fill in the blanks.
a. The greatest factor of a number is the _________.

b. _________ is a factor of every number.
c. When a number is divided by its factor, the remainder is _________.

d. The number _________ has only one factor.
e. The smallest number which has exactly two factors 1 and the number itself is

_________.

8. Check whether the smaller number in each pair is a factor of the bigger number.

a. 8, 124 b. 16, 368 c. 24, 360 d. 21, 193

CoMMoN MulTiPleS ANd CoMMoN FACTorS

Common Multiples

We have learnt how to find multiples of a number. Suppose you are given multiples of

two or more numbers, then obviously some multiples will be common among them.
These are called common multiples.

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Multiples and Factors