Find the prime factors of 18.

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Presentation transcript:

18 2 9 3 3 Find the prime factors of 18. To find prime factors draw a factor tree. Split 18 into a pair of factors. 18 2 9 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 32 The prime factors of 18 are 2 x 3 x 3

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

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

20 4 5 2 2 Find the prime factors of 20. 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

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

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

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

24 4 6 2 2 2 3 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

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!

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

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

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

The prime factors of 22 are 2 x 11

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

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

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

The prime factors of 125 are 5x5x5 or 53

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

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