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1.1 Worksheet

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27 views4 pages

1.1 Worksheet

Uploaded by

yaseenpanjwani1982
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Prime Factors

Unit 1 (1.1 Factors, Multiples and Primes)

Fill in the missing numbers to complete the factor trees. Then write each number as a
product of its prime numbers.

1. 15 2. 21 3. 38

3 7 2

15 = 3 x 21 = x7 38 = 2 x

4. 55 5. 39 6. 14

55 = x 39 = x 14 = x

7. 24 8. 68 9. 90

3 2

2 3

68 = 2 x x

24 = 3 x 2 x 2 x 90 = x3x x

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Prime Factors
Draw a line to match each number with its corresponding prime factorization.
10. 81 a. 2 x 3 x 11

11. 52 b. 2 x 2 x 2 x 2 x 2 x 3

12. 76 c. 2 x 2 x 19

13. 96 d. 3 x 3 x 3 x 3

14. 66 e. 2 x 2 x 13

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Prime Factors Answers
1. 15 2. 21 3. 38

3 5 3 7 2 19

15 = 3 x 5 21 = 3 x 7 38 = 2 x 19

4. 55 5. 39 6. 14

5 11 3 13 2 7

55 = 5 x 11 39 = 3 x 13 14 = 2 x 7

7. 24 8. 68 9. 90

3
3 8 2 34 3 30

2 4 2 17 3 10

68 = 2 x 2 x 17

2 2 2 5

24 = 3 x 2 x 2 x 2 90 = 3 x 3 x 2 x 5

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Prime Factors Answers

10. 81 = d. 3 x 3 x 3 x 3

11. 52 = e. 2 x 2 x 13

12. 76 = c. 2 x 2 x 19

13. 96 = b. 2 x 2 x 2 x 2 x 2 x 3

14. 66 = a. 2 x 3 x 11

Page 2 of 2 visit twinkl.ca

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