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Division

Using multiplication and repeated subtraction. Division. What’s It All About?. You are going to learn: How to divide by inversing multiplication and using repeated subtraction. What skills should you have already?

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Division

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  1. Using multiplication and repeated subtraction Division

  2. What’s It All About? You are going to learn: How to divide by inversing multiplication and using repeated subtraction. What skills should you have already? You need to be able to multiply and subtract two values using a written method.

  3. Division Remember that 6 ÷ 3 means “how many threes make 6?” Division is the INVERSE of Multiplication. There are different ways of showing division. 6 ÷ 3 The answer is the same in all three cases!

  4. Using Multiplying to Divide The answer is 5. For multiplying, we can use a grid like this: We can now use it to divide as well as multiply. Example: 20  4 means “How many 4’s make 20?”

  5. Your Turn Remember that 6 ÷ 3 means “how many threes make 6?” Work out: 1. 16 ÷ 4 2. 30 ÷ 5 3. 30 ÷ 10 4. 45 ÷ 9 5. 72 ÷ 8 6. 21 ÷ 3 7. 21 ÷ 7

  6. Repeated Subtraction 1 Work out £192 ÷ 6 Set up the method: Multiply 6 by something easy such as 10 or 100, then subtract. Repeat this until you have nothing left or the number that is left is less than 6. Stop. Total up the 6’s. 6 192 10 60 132 10 60 72 60 10 12 2 12 0 32 £192  6 = 32

  7. Repeated Subtraction 2 Work out £324 ÷ 12 Set up the method: Multiply 12 by something easy such as 10 or 100, then subtract. Repeat this until you have nothing left or the number that is left is less than 12. Stop. Total up the 12’s. 12 324 10 120 204 10 120 84 60 5 24 2 24 0 27 £324  12 = 27

  8. Repeated Subtraction 3 Work out £3010 ÷ 14 Set up the method: Choosing sensible numbers reduces the amount of subtracting you have to do .... 14 3010 Multiply 14 by something easy such as 10 or 100, then subtract. Repeat this until you have nothing left or the number that is left is less than 14. Stop. Total up the 14’s. 100 1400 1610 100 1400 210 140 10 70 5 70 0 215 £3010  14 = 215

  9. Your Turn Remember that 6 ÷ 3 means “how many threes make 6?” Work out: 1. 164 ÷ 4 2. 305 ÷ 5 3. 3040 ÷ 10 4. 4509 ÷ 9 5. 156 ÷ 12 6. 315 ÷ 15 7. 3040 ÷ 20 8. 2814 ÷ 14

  10. End

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