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Find the prime factors of 18.

18. To find prime factors draw a factor tree. Find the prime factors of 18. Split 18 into a pair of factors. 9. 2. Split 9 into a pair of factors. 2 is a prime number – so this branch is finished. 3. 3. The prime factors of 18 are 2 x 3 x 3. The prime factors of 18 are 2 x 3 2.

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Find the prime factors of 18.

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  1. 18 To find primefactors draw a factor tree. Find the prime factors of 18. Split 18 into a pair of factors. 9 2 Split 9 into a pair of factors. 2 is a prime number – so this branch is finished 3 3 The prime factors of 18 are 2 x 3 x 3 The prime factors of 18 are 2 x 32

  2. 18 Find the prime factors of 18. Split 18 into a pair of factors. 6 3 Split 6 into a pair of factors. 3 is a prime number – so this branch is finished 3 2 The prime factors of 18 are 2 x 3 x 3 The prime factors of 18 are 2 x 32

  3. 20 Find the prime factors of 20. Split 20 into a pair of factors. 10 2 Split 10 into a pair of factors. 5 2 The prime factors of 20 are 2 x 2 x 5 The prime factors of 20 are 22 x 5

  4. 20 Find the prime factors of 20. 5 4 Split 4 into a pair of factors. 2 2 The prime factors of 20 are 2 x 2 x 5 The prime factors of 20 are 22 x 5

  5. 24 Find the prime factors of 24. The prime factors of 24 are 23 x 3 The prime factors of 24 are 2 x 2 x 2 x 3 12 2 6 2 3 2

  6. 24 Find the prime factors of 24. The prime factors of 24 are 23 x 3 The prime factors of 24 are 2 x 2 x 2 x 3 12 2 4 3 2 2

  7. 24 Find the prime factors of 24. The prime factors of 24 are 23 x 3 The prime factors of 24 are 2 x 2 x 2 x 3 8 3 4 2 2 2

  8. 24 Find the prime factors of 24. 6 4 2 2 3 2 The prime factors of 24 are 23 x 3 The prime factors of 24 are 2 x 2 x 2 x 3

  9. Find the prime factors of these numbers: 12 16 30 22 28 64 100 125 240 144 Remember to find prime factors you draw a factor tree!

  10. 12 12 6 2 4 3 3 2 2 2 The prime factors of 12 are 2x2x3 or 22 x 3

  11. 16 16 4 4 8 2 2 2 2 2 2 4 2 2 The prime factors of 16 are 2x2x2x2 or 24

  12. 30 30 2 15 6 5 5 3 3 2 The prime factors of 30 are 2 x 3 x 5

  13. 22 2 11 The prime factors of 22 are 2 x 11

  14. 28 28 2 14 4 7 2 7 2 2 The prime factors of 28 are 2x2x7 or 22 x 7

  15. 64 8 8 2 4 2 4 2 2 2 2 The prime factors of 64 are 2x2x2x2x2x2 or 26

  16. 100 5 20 5 4 2 2 The prime factors of 100 are 2x2x5x5 or 22 x 52

  17. 125 5 25 5 5 The prime factors of 125 are 5x5x5 or 53

  18. 240 10 24 4 2 5 6 2 2 2 3 The prime factors of 240 are 24 x 3 x 5

  19. 144 12 12 3 4 3 4 2 2 2 2 The prime factors of 144 are 24 x 32

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