Numbers and Calculation 2

Find all factors of 18

• 2, 3, 6, 9

• 1, 2, 3, 6, 8, 18

• 1, 2, 3, 6, 9, 18

• 2 and 3

What is the next digit of

4, 7, 10, 13, 16, ... , ....

• 20 and 23

• 19 and 22

• 20 and 24

• 19, 23

Two numbers that are multiples of 7 are ...

(multiple correct answers)

• 7 and 15

• 35 and 63

• 84 and 49

• 42 and 23

A number that are multiples of 5 and 8 is ...

• 120

• 160

• 58

• 85

What is the seventh multiple of 12?

• 19

• 60

• 74

• 84

Is 39 a prime number?

• Yes

• No

Which numbers between 30 and 40 have just two factors?

(multiple correct answers)

• 33

• 31

• 35

• 37

Complete this sentence:

A number which has only two different factors, itself and 1, is called a ... number

The prime factors of 40 are ...

• 1, 2, 4, 5, 8, 20, 20, 40

• 2 and 5

• 2, 4, 5, 8, 20, 10

• 5 and 8

Find the prime factors of 45

• 5 and 9

• 1, 3, 5, 9, 15, 45

• 3 and 5

• 3, 5, 9, 15