Prime and Composite Numbers

The number 132 is to be written as a product of its prime factors. Which one of the following is correct?

• 132 = 2 × 6 × 11

• 132 = 2² × 3² × 5

• 132 = 2² × 3² × 5

• 132 = 3 × 4 × 11

Tags

CCSS.6.EE.A.3

CCSS.6.EE.A.4

The number 240 is to be written as a product of its prime factors. Which one of the following is correct?

• 240 = 2³ × 5²

• 240 = 3 × 5 × 16

• 240 = 2³ × 5 × 6

• 240 = 2⁴ × 3 × 5

Tags

CCSS.6.EE.A.1

CCSS.6.EE.A.4

The number 756 is to be written as a product of its prime factors. Which one of the following is correct?

• 2² × 3³ × 7

• 2² × 3² × 21

• 4 × 3³ × 7

• 2 × 3 × 5³

Tags

CCSS.6.EE.A.1

CCSS.6.EE.A.4

What is the sum of the prime factors of 72?

• 11

• 12

• 13

• 5

First write 72 as a product of its prime factors:

72

= 2 × 36

= 2 × 2 × 18

= 2 × 2 × 2 × 9

= 2 × 2 × 2 × 3 × 3 (or 2³ × 3²) what is the sum?

Tags

CCSS.6.EE.A.3

What is the sum of the prime factors of 240?

• 16

• 14

• 240 = 2 + 2 + 2 + 2 + 3 + 5 = 16

• 240 = 2⁴ × 3 × 5 =1 6

Bob and Cindy each choose any one of the prime numbers 2, 3 or 5 (their choice could be the same or different from the others).

Their numbers are then multiplied together (for example 3 × 3 × 2 = 18)

How many different products can there be?

• 27

• 10

• 12