Prime Factors By M. R. Barker.

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Presentation transcript:

Prime Factors By M. R. Barker

WALT What Are we Learning Today? To express numbers in Prime factors To use index notation. M.R.Barker©

Connecting - Factor Practice List all the factors of the following numbers 9 30 1,2,3.5.6,10,15, 30 24 1, 2, 3, 4, 6, 8, 12, 24 1, 3, 9 48 1, 2, 3, 4, 6,8, 12, 16, 24, 48 12 1,2,3,4,6,12 M.R.Barker©

Special Ones What are the factors of these numbers? 7 11 13 23 5 Is there anything special about them? M.R.Barker©

Prime Numbers have only two factors, itself and one Write down two prime numbers greater than 30

Prime Factors 24 8 3 4 2 24 = 2 X 2 X 2 X 3 2 2 24 = 23 X 3 M.R.Barker©

Example 90 2 45 90 = 2 x 3 x 3 x 5 5 9 90 = 2 x 32 x 5 3 3 M.R.Barker©

Express in Prime Factors 18 60 32 50 40 27 84 M.R.Barker©

More Challenge 120 100 400 250 150 48 1000

HOMEWORK Express the following as a product of primes 32 45 72 65 77 54 Investigate Twin Primes between 100 & 200

TWIN PRIMES HOMEWORK INVESTIGATION 101 103 191 193 107 109 149 151 137 139 M.R.Barker©