Prime and Composite Numbers

Prime and Composite Numbers

​Objective

Tell the difference between prime and composite numbers

A composite number is a number that has more than two factors.

Composite Number

A prime number is a number that has exactly two factors, 1 and itself.

​Prime Numbers

Definition

4, 6, 8, and 9

Composite Number

2, 3, 5 and 7

​Prime Numbers

Examples

Multiple Choice

Is number 1 a prime number?

• True

• False

Multiple Choice

What kind of number is 1?

• prime

• composite

• nothing

• special

Multiple Choice

There are ____ prime numbers from 1 to 100.

• 23

• 24

• 25

• 26

Multiple Select

23 has two factors, ____ and ____.

• 23

• 7

• 3

• 9

• 1

Multiple Choice

The next prime number after 29 is ____.

• 33

• 27

• 31

• 30

• 37

Multiple Choice

The prime number from 90 to 100 is ____.

• 91

• 97

• 93

• 95

• 99

12: 1, 2, 3, 4, 6 and 12
six factors

21: 1, 3, 7 and 21
four factors

25: 1, 5 and 25
three factors

40: 1, 2, 4, 5, 8, 10, 20 and 40

eight factors

​

Factors of composite numbers.

18:


33:


81:

90:

​

Multiple Choice

There are ____ composite numbers from 1 to 100.

• 73

• 74

• 75

• 76

Multiple Select

27 has four factors, ____, ____, ____ and ____.

• 1

• 3

• 7

• 9

• 27

Multiple Choice

The composite number after 38 is ____.

• 39

• 40

• 41

• 42

• 43

Multiple Choice

There are ____ composite numbers from 70 to 80.

• 6

• 7

• 8

• 9

• 11