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Prime and Composite Numbers

Authored by Annie Waldow

Mathematics

4th - 5th Grade

CCSS covered

Prime and Composite Numbers
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7 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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.4

CCSS.6.EE.A.3

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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.4

CCSS.6.EE.A.1

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

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.4

CCSS.6.EE.A.1

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the sum of the prime factors of 72?

11

12

13

5

5.

FILL IN THE BLANKS QUESTION

30 sec • 1 pt

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?

(a)  

Tags

CCSS.6.EE.A.3

6.

MULTIPLE SELECT QUESTION

1 min • 1 pt

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

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

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