1. Prime Factors
By M. R. Barker

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

3. 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©

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

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

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

7. Example 90 2 45
90 = 2 x 3 x 3 x 5 5 9
90 = 2 x 32 x 5 3 3
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8. Express in Prime Factors18 60 32 50 40 27 84
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9. More Challenge
120
100
400
250
150 48
1000

10. HOMEWORK Express the following as a product of primes
Investigate Twin Primes between 100 & 200

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