Name
Grade
School

Date
Questions20
Score

1

What are the prime factors of 42?

2

What are the prime factors of 45?

3

What are the prime factors of 36?

4

What are the prime factors of 56?

5

What are the prime factors of 60?

6

What are the prime factors of 100?

7

What are the prime factors of 44?

8

What are the prime factors of 12?

9

What are the prime factors of 165?

10

What are the prime factors of 101?

11

What are the prime factors of 1009?

12

What are the prime factors of 120?

13

What are the prime factors of 140?

14

What are the prime factors of 18?

15

What are the prime factors of 16?

16

What are the prime factors of 1729?

17

What are the prime factors of 20?

18

What are the prime factors of 24?

19

What are the prime factors of 210?

20

What are the prime factors of 28?

Answers Key

1

What are the prime factors of 42?

2 x 3 x 7

Prime factor of 42

2, 3 & 7 are the prime factors of 42

42 = 2 x 3 x 7

2 | 42 |

3 | 21 |

7 | 7 |

1 |

42 = 2 x 3 x 7

2

What are the prime factors of 45?

3 x 3 x 5

Prime factor of 45

3, 3 & 5 are the prime factors of 45

45 = 3 x 3 x 5

3 | 45 |

3 | 15 |

5 | 5 |

1 |

45 = 3 x 3 x 5

3

What are the prime factors of 36?

2 x 2 x 3 x 3

Prime factor of 36

2, 2, 3 & 3 are the prime factors of 36

36 = 2 x 2 x 3 x 3

2 | 36 |

2 | 18 |

3 | 9 |

3 | 3 |

1 |

36 = 2 x 2 x 3 x 3

4

What are the prime factors of 56?

2 x 2 x 2 x 7

Prime factor of 56

2, 2, 2 & 7 are the prime factors of 56

56 = 2 x 2 x 2 x 7

2 | 56 |

2 | 28 |

2 | 14 |

7 | 7 |

1 |

56 = 2 x 2 x 2 x 7

5

What are the prime factors of 60?

2 x 2 x 3 x 5

Prime factor of 60

2, 2, 3 & 5 are the prime factors of 60

60 = 2 x 2 x 3 x 5

2 | 60 |

2 | 30 |

3 | 15 |

5 | 5 |

1 |

60 = 2 x 2 x 3 x 5

6

What are the prime factors of 100?

2 x 2 x 5 x 5

Prime factor of 100

2, 2, 5 & 5 are the prime factors of 100

100 = 2 x 2 x 5 x 5

2 | 100 |

2 | 50 |

5 | 25 |

5 | 5 |

1 |

100 = 2 x 2 x 5 x 5

7

What are the prime factors of 44?

2 x 2 x 11

Prime factor of 44

2, 2 & 11 are the prime factors of 44

44 = 2 x 2 x 11

2 | 44 |

2 | 22 |

11 | 11 |

1 |

44 = 2 x 2 x 11

8

What are the prime factors of 12?

2 x 2 x 3

Prime factor of 12

2, 2 & 3 are the prime factors of 12

12 = 2 x 2 x 3

2 | 12 |

2 | 6 |

3 | 3 |

1 |

12 = 2 x 2 x 3

9

What are the prime factors of 165?

3 x 5 x 11

Prime factor of 165

3, 5 & 11 are the prime factors of 165

165 = 3 x 5 x 11

3 | 165 |

5 | 55 |

11 | 11 |

1 |

165 = 3 x 5 x 11

10

What are the prime factors of 101?

101

Prime factor of 101

& 101 are the prime factors of 101

101 = 101

101 | 101 |

1 |

101 = 101

11

What are the prime factors of 1009?

1009

Prime factor of 1009

& 1009 are the prime factors of 1009

1009 = 1009

1009 | 1009 |

1 |

1009 = 1009

12

What are the prime factors of 120?

2 x 2 x 2 x 3 x 5

Prime factor of 120

2, 2, 2, 3 & 5 are the prime factors of 120

120 = 2 x 2 x 2 x 3 x 5

2 | 120 |

2 | 60 |

2 | 30 |

3 | 15 |

5 | 5 |

1 |

120 = 2 x 2 x 2 x 3 x 5

13

What are the prime factors of 140?

2 x 2 x 5 x 7

Prime factor of 140

2, 2, 5 & 7 are the prime factors of 140

140 = 2 x 2 x 5 x 7

2 | 140 |

2 | 70 |

5 | 35 |

7 | 7 |

1 |

140 = 2 x 2 x 5 x 7

14

What are the prime factors of 18?

2 x 3 x 3

Prime factor of 18

2, 3 & 3 are the prime factors of 18

18 = 2 x 3 x 3

2 | 18 |

3 | 9 |

3 | 3 |

1 |

18 = 2 x 3 x 3

15

What are the prime factors of 16?

2 x 2 x 2 x 2

Prime factor of 16

2, 2, 2 & 2 are the prime factors of 16

16 = 2 x 2 x 2 x 2

2 | 16 |

2 | 8 |

2 | 4 |

2 | 2 |

1 |

16 = 2 x 2 x 2 x 2

16

What are the prime factors of 1729?

7 x 13 x 19

Prime factor of 1729

7, 13 & 19 are the prime factors of 1729

1729 = 7 x 13 x 19

7 | 1729 |

13 | 247 |

19 | 19 |

1 |

1729 = 7 x 13 x 19

17

What are the prime factors of 20?

2 x 2 x 5

Prime factor of 20

2, 2 & 5 are the prime factors of 20

20 = 2 x 2 x 5

2 | 20 |

2 | 10 |

5 | 5 |

1 |

20 = 2 x 2 x 5

18

What are the prime factors of 24?

2 x 2 x 2 x 3

Prime factor of 24

2, 2, 2 & 3 are the prime factors of 24

24 = 2 x 2 x 2 x 3

2 | 24 |

2 | 12 |

2 | 6 |

3 | 3 |

1 |

24 = 2 x 2 x 2 x 3

19

What are the prime factors of 210?

2 x 3 x 5 x 7

Prime factor of 210

2, 3, 5 & 7 are the prime factors of 210

210 = 2 x 3 x 5 x 7

2 | 210 |

3 | 105 |

5 | 35 |

7 | 7 |

1 |

210 = 2 x 3 x 5 x 7

20

What are the prime factors of 28?

2 x 2 x 7

Prime factor of 28

2, 2 & 7 are the prime factors of 28

28 = 2 x 2 x 7

2 | 28 |

2 | 14 |

7 | 7 |

1 |

28 = 2 x 2 x 7