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- 1. Whole Numbers Factors What will we learn today? • determining if a 1-digit number is a factor of a given number, • listing all factors of a given number up to 100, • finding the common factors of two given numbers
- 2. What are factors?A factor is a smaller number thatdivides exactly any larger number andgives the remainder zero.For example,6 is not "exactly divisible" by 4 and 5.So, 4 and 5 are not factors of 6.
- 3. How to find factors of a number? We will find all the factors of 12 by finding all the numbers that 12 can be exactly divided by. 12 ÷ 1 = 12 12 ÷ 2 = 6 12 ÷ 3 = 4 12 ÷ 4 = 3 12 ÷ 6 = 2 12 ÷ 12 = 1 12 is exactly divisible by 1, 2, 3, 4, 6 and 12.So 1, 2, 3, 4, 6 and 12 are the factors of 12.
- 4. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 9 1 3 15 1 15
- 5. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 1x7=7 9 1 3 15 1 15
- 6. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 1x7=7 9 1 3 9 1x9=9,3x3=9 15 1 15
- 7. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 1x7=7 9 1 3 9 1x9=9,3x3=9 15 1 3 5 15 1 x 15 = 15 3 x 5 = 15
- 8. What are the factors of 20?
- 9. What are the factors of 20? 1 x 20 = 20 2 x 10 = 20 4 x 5 = 20 Step 1:Write down the multiplication sentences of 20.
- 10. What are the factors of 20? 1 x 20 = 20 2 x 10 = 20 4 x 5 = 20Step 2: Do not write the factors twice. 4 x 5 = 5 x 4. You only need to write down 4 and 5 once.
- 11. What are the factors of 20? 1 x 20 = 20 2 x 10 = 20 4 x 5 = 2020 is exactly divisible by 1, 2, 4, 5, 10 and 20.So 1, 2, 4, 5, 10 and 20 are the factors of 20.
- 12. What are the common factors of 40 and 72?
- 13. What are the common factors of 40 and 72?1 x 40 = 40 1 x 72 = 722 x 20 = 40 2 x 36 = 724 x 10 = 40 3 x 24 = 72 4 x 18 = 725 x 8 = 40 6 x 12 = 72 8 x 9 = 72 Step 1: List down all the factors.
- 14. What are the common factors of 40 and 72?1 x 40 = 40 1 x 72 = 722 x 20 = 40 2 x 36 = 724 x 10 = 40 3 x 24 = 72 4 x 18 = 725 x 8 = 40 6 x 12 = 72 8 x 9 = 72 Step 2: Circle the common number you see.
- 15. What are the common factors of 40 and 72?1 x 40 = 40 1 x 72 = 722 x 20 = 40 2 x 36 = 724 x 10 = 40 3 x 24 = 72 4 x 18 = 725 x 8 = 40 6 x 12 = 72 8 x 9 = 72 The common factors are 1, 2, 4 and 8.
- 16. Are you ready to try out the questions?

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