Subtraction Using Partitioning

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Step 3 towards using a standard written method for subtraction

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Subtraction Using Partitioning

  1. 1. Subtraction Of Whole Numbers Using Partitioning (the 3rd step towards using a standard written method for subtraction) For more maths help & free games related to this, visit: www.makemymathsbetter.com
  2. 2. Before you start to subtract using partitioning you should be confident in “counting back” using a number line. For example: 86 - 47 = 39 Subtracting the tens first, followed by the units: -7 39 - 40 46 86
  3. 3. Before you start to subtract using partitioning you should be confident in “counting back” using a number line. For example: 86 - 47 = 39 Subtracting the tens first, followed by the units: -7 39 - 40 46 Subtracting using partitioning builds on this. You 1st have to split the smaller number into tens and units e.g. 47 = 40 + 7 86
  4. 4. Before you start to subtract using partitioning you should be confident in “counting back” using a number line. For example: 86 - 47 = 39 Subtracting the tens first, followed by the units: -7 39 - 40 46 Subtracting using partitioning builds on this. You 1st have to split the smaller number into tens and units e.g. 47 = 40 + 7 Then, you need to subtract the tens: 86
  5. 5. Before you start to subtract using partitioning you should be confident in “counting back” using a number line. For example: 86 - 47 = 39 Subtracting the tens first, followed by the units: -7 39 - 40 46 Subtracting using partitioning builds on this. You 1st have to split the smaller number into tens and units e.g. 47 = 40 + 7 Then, you need to subtract the tens: 86 – 47: 86 – 40 = 46 86
  6. 6. Before you start to subtract using partitioning you should be confident in “counting back” using a number line. For example: 86 - 47 = 39 Subtracting the tens first, followed by the units: -7 39 - 40 46 Subtracting using partitioning builds on this. You 1st have to split the smaller number into tens and units e.g. 47 = 40 + 7 Then, you need to subtract the tens: 86 – 47: 86 – 40 = 46 Finally, you subtract the units: 86
  7. 7. Before you start to subtract using partitioning you should be confident in “counting back” using a number line. For example: 86 - 47 = 39 Subtracting the tens first, followed by the units: -7 39 - 40 46 Subtracting using partitioning builds on this. You 1st have to split the smaller number into tens and units e.g. 47 = 40 + 7 Then, you need to subtract the tens: 86 – 47: 86 – 40 = 46 Finally, you subtract the units: 46 – 7 = 39 86
  8. 8. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5
  9. 9. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5 Firstly, the hundreds are subtracted:
  10. 10. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5 Firstly, the hundreds are subtracted: 527 – 300 = 227
  11. 11. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5 Firstly, the hundreds are subtracted: 527 – 300 = 227 Then the tens:
  12. 12. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5 Firstly, the hundreds are subtracted: 527 – 300 = 227 Then the tens: 227 – 40 = 187
  13. 13. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5 Firstly, the hundreds are subtracted: 527 – 300 = 227 Then the tens: 227 – 40 = 187 Finally the units:
  14. 14. A similar process can be used with bigger numbers, for example 527 - 345 This time the smaller number is split up into hundreds, tens & units: e.g. 345 = 300 + 40 + 5 Firstly, the hundreds are subtracted: 527 – 300 = 227 Then the tens: 227 – 40 = 187 Finally the units: 187 – 5 = 182
  15. 15. That’s it for now...... For more help with your maths, try my book: mastering multiplication tables on amazon.com

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