Prime and Composite Numbers

Prime Numbers

• Numbers that have only two factors.

• For example: What are the factors of 5? 5 and 1, since 5 has only two factors it is then a prime number.

Multiple Select

True or False. 7 is a prime number.

• True

• False

Multiple Select

True or False. 12 is not a prime number.

• True

• False

Composite Numbers

• Numbers with more than 2 factors.

• For example: What are the factors of 12?

• 12 and 1, 3 and 4, 2 and 6

• The factors of 12 are 1, 2, 3, 4, 6, and 12. Since it has more than two factors, then it is a composite number.

Multiple Choice

What are the complete factors of 10?

• 1 and 10

• 1,2, 5, 6, and 10

• 2 and 5

• 1, 2, 5, and 10

Multiple Choice

All the given numbers are prime except from:

• 9

• 7

• 11

• 19

Fill in the Blank

The factors of 24 are 1, 2, 3, 4, _, 8, 12, and 24.

Multiple Choice

What are the factors of 16?

• 1, 2, 3, 8, and 16

• 1, 2, 4, 6, and 8

• 1, 2, 4, 8, and 16

• 1, 2 4, 6, and 16

Fill in the Blank

Give all the factors of 25.

_, _, and _

Multiple Choice

Prime or Composite.

27

• Prime

• Composite

Multiple Choice

Prime or Composite.

39

• Prime

• Composite

Multiple Choice

Prime or Composite.

61

• Prime

• Composite

Multiple Choice

Prime or Composite.

13

• Prime

• Composite

Multiple Choice

Prime or Composite.

54

• Prime

• Composite

Multiple Choice

Prime or Composite.

63

• Prime

• Composite

Multiple Choice

Prime or Composite.

99

• Prime

• Composite

Multiple Choice

Prime or Composite.

47

• Prime

• Composite

Multiple Choice

Prime or Composite.

75

• Prime

• Composite

Multiple Choice

What is the highest 2-digit multiple of 7?

• 70

• 77

• 97

• 98

Fill in the Blank

What is the largest composite number from 1 to 100?

Fill in the Blank

What is the largest prime number from 1 to 100?

Fill in the Blank

What is the smallest prime number?

Fill in the Blank

What is the smallest composite number?

Fill in the Blank

What is the largest 2-digit composite number?