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In the field of Algebra, multiples of a single number are its times table. When you are asked for 'common multiples' of two numbers then things get a little more complicated!

Have a go at this Math quiz and you will soon understand.

1.

The 2^{nd} and 3^{rd} multiples of a number are 22 and 33. What is the number?

5

7

9

11

2.

What are the first 3 multiples of 15?

3, 5, 7.5

5, 10, 15

15, 30, 45

30, 60, 90

1 x 15 = 15; 2 x 15 = 30; 3 x 15 = 45

3.

What are the first 4 multiples of 7?

0, 7, 14, 21

1, 7, 14, 21

7, 14, 21, 28

14, 21, 28, 35

1 x 7 = 7; 2 x 7 = 14; 3 x 7 = 21; 4 x 7 = 28

4.

Which of the following are common factors of 6, 12, 18 and 24?

2 and 3

3 and 4

4 and 5

5 and 6

Both 2 and 3 will divide into all the numbers given (6, 12, 18 and 24)

5.

The 4^{th} and 5^{th} multiples of a number are 24 and 30. What is the number?

3

6

9

10

6.

Is 66 a multiple of 3 and 11?

Yes

No

Seldom

Often

Both 3 and 11 will divide into 66 and give results of a whole number

7.

Which of the following is a common factor of 15, 30, 45 and 60?

2

3

4

10

5 and 3 can be divided into all the numbers given and the result is always a whole number. Remember that multiples are always whole numbers

8.

Is the number 43 a multiple of the number 11?

Yes

No

Seldom

Often

44 is a multiple of 11 but 43 most definitely is not!

9.

Which of these numbers is not a multiple of 3 and 4?

12

36

48

50

3 and 4 cannot be divided into 50 to give answers of whole numbers

10.

The first 3 multiples of a number are 8, 16, 24. What is the number?

8

16

24

32

8, 16 and 24 are all in the 8 times table