Subtraction Using An Expanded Method (part 2 of 5)

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Subtraction Using An Expanded Method (part 2 of 5)

  1. 1. Subtraction Of Whole Numbers Using An Expanded Method (the last step towards using a standard written method for subtraction) Part 2 of 5: Subtraction with adjustment from the hundreds. For more maths help & free games related to this, visit: www.makemymathsbetter.com
  2. 2. Subtraction Of Whole Numbers Using An Expanded Method (the last step towards using a standard written method for subtraction) Part 2 of 5: Subtraction with adjustment from the hundreds. It is important that you have already viewed and understood part 1 before you go any further. For more maths help & free games related to this, visit: www.makemymathsbetter.com
  3. 3. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 400 _ 30 6 200 80 5
  4. 4. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. 400 _ 30 6 200 80 5
  5. 5. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. 300 400 _ 30 6 200 80 5
  6. 6. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5
  7. 7. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 1 The units should then be subtracted.
  8. 8. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 50 1 Followed by the tens
  9. 9. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. Then the hundreds 300 400 _ 130 6 200 80 5 100 50 1
  10. 10. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 Finally, add the numbers together to find the total
  11. 11. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 4 3 6 _ 2 8 5
  12. 12. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 4 3 6 _ 2 8 5 1 Start with the units
  13. 13. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 4 3 6 _ 2 8 5 1 Start with the units
  14. 14. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 4 3 6 _ 2 8 5 1 Then make an adjustment from the hundreds
  15. 15. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 4 3 6 _ 2 8 5 1 Then make an adjustment from the hundreds
  16. 16. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 4 3 6 _ 2 8 5 1 Then make an adjustment from the hundreds to the tens
  17. 17. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 13 4 3 6 _ 2 8 5 1 Then make an adjustment from the hundreds to the tens
  18. 18. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 13 4 3 6 _ 2 8 5 5 1 Then, subtract the tens
  19. 19. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 13 4 3 6 _ 2 8 5 5 1 Then, subtract the tens
  20. 20. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 13 4 3 6 _ 2 8 5 1 5 1 And, finally subtract the hundreds
  21. 21. When subtracting, the tens in the bigger number is sometimes smaller than the tens in the smaller number, e.g. 436 – 285 When this happens, an adjustment is made from the hundreds to the tens. A hundred is effectively taken from the hundreds column. And added to the tens column. 300 400 _ 130 6 200 80 5 100 + 50 + 1 = 151 When this can be performed confidently, it can be simplified to a standard written method: 3 13 4 3 6 _ 2 8 5 1 5 1 And, finally subtract the hundreds
  22. 22. That’s it for now...... For more help with your maths, try my book: mastering multiplication tables on amazon.com

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