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Prime+Factorization+ +tree+2

The document provides exercises and answers for finding prime factors using factor trees. It includes examples for numbers such as 15, 25, 49, and 65, as well as detailed factor trees for numbers like 24, 30, 72, and 84. The answer key offers the prime factorization for each number presented in the exercises.

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akghory
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15 views4 pages

Prime+Factorization+ +tree+2

The document provides exercises and answers for finding prime factors using factor trees. It includes examples for numbers such as 15, 25, 49, and 65, as well as detailed factor trees for numbers like 24, 30, 72, and 84. The answer key offers the prime factorization for each number presented in the exercises.

Uploaded by

akghory
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Prime Factor Trees

1. Find the two prime factors of the numbers below:

a. b. c. d.
15 25 49 65

15 = × 25 = × 49 = × 65 = ×

2. Complete the factor trees below:

a. b.
24 30

6 5

24 = × × × 30 = × ×

c. d.
72 84

72 = × × × × 84 = × × ×

Page 1 of 4 visit twinkl.ca


Prime Factor Trees

3. Create factor trees to find the prime factors of the numbers below.

a. b.
28 42

28 = 42 =

c. d.
81 100

81 = 100 =

e. f.
108 144

108 = 144 =

Page 2 of 4 visit twinkl.ca


Prime Factor Trees ANSWER KEY
1. Find the two prime factors of the numbers below:

a. b. c. d.
15 25 49 65

3 5 5 5 7 7 5 13

15 = 3 × 5 25 = 5 × 5 49 = 7 × 7 65 = 5 × 13

2. Complete the factor trees below:

a. b.
24 30

4 6 5 6

2 2 2 3 3 2

24 = 2 × 2 × 2 × 3 30 = 5 × 3 × 5

c. d.
72 84

4 18 7 12

2 2 2 9 3 4

3 3 2 2

72 = 2 × 2 × 2 × 3 × 3 84 = 2 × 2 × 3 × 7

Page 3 of 4 visit twinkl.ca


Prime Factor Trees ANSWER KEY

3. Create factor trees to find the prime factors of the numbers below.

a. b.
28 42

7 4 3 14

2 2 2 7

28 = 2 × 2 × 7 42 = 2 × 3 × 7

c. d.
81 100

9 9 2 50

3 3 3 3 2 25

5 5

81 = 3 × 3 × 3 × 3 100 = 2 × 2 × 5 × 5

e. f.
108 144

9 9 12 12

4 3 3 4
3 3 3 3

2 2 2 2

108 = 2 × 2 × 3 × 3 × 3 144 = 2 × 2 × 2 × 2 × 3 × 3

Page 4 of 4 visit twinkl.ca

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