Factors and Multiples

Which of these numbers is a multiple of 20?

• 1

• 5

• 25

• 40

Write down the first four multiples of 6

Write down the first even multiple of 9

From the list of numbers

1 7 9 12 21 23 30 36 42

Write down all the multiples of 7

• 7

• 7, 21 and 42

• 7 and 21

• 1 and 7

The factors of 30 are

1, 2, 3, 5, ?, 10, ? 30

What are the two missing numbers?

• 6 and 16

• 7 and 6

• 6 and 15

• 8 and 4

From the list of numbers

3 5 7 9 11 15 24

Write down a factor of 12

From the list of numbers

3 5 7 9 11 15 24

Write down all the factors of 21

Sam says 11.5 is a factor of 21 because  $21\div2\ =\ 11.5$  
Do you agree?

Explain your answer.

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Here is a list of numbers

6 10 11 16 24 30 40

Which numbers are multiples of 10?

• 6

• 30 and 40

• 20

• 10, 30 and 40

Write down a number less that 30 that is a multiple of both 4 and 5.