Prime Numbers.

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Presentation transcript:

Prime Numbers

Multiples Factors 2 12 5 20 7 21 10 15 3 11

Prime Numbers These are numbers that have only two factors : themselves and one. An example of Prime Numbers would be 3 = 1 , 3 7 = 1 , 7 11 = 1, 11

Composite Number Has more than 2 factors

Follow these steps to find the prime numbers Cross out 1 as it is not a prime . Circle the prime number 2 then cross out all multiple of 2. Circle the next number, 3. This is a prime .now cross out all multiple of 3. Circle the next number, 5. This is a prime .now cross out all multiple of 5. Continue using this method until all composite numbers have been crossed out.

Review Can you tell if these numbers are prime? 110 21 29 7 15 45 4 37 23 31 49

I CAN DO