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Subtraction Using an Expanded Method (part 3 of 5)

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Subtraction Using an Expanded Method (part 3 of 5)

1. 1. Subtraction Of Whole Numbers Using An Expanded Method (the last step towards using a standard written method for subtraction) Part 3 of 5: Subtraction with adjustment from the tens. 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 3 of 5: Subtraction with adjustment from the tens. It is important that you have already viewed and understood parts 1 & 2 before you go any further. For more maths help & free games related to this, visit: www.makemymathsbetter.com
3. 3. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 400 _ 70 5 200 20 9
4. 4. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. 400 _ 70 5 200 20 9
5. 5. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. 400 _ 60 70 5 200 20 9
6. 6. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9
7. 7. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. The calculation can then be carried out: 400 _ 60 70 15 5 200 20 9
8. 8. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 6 Firstly, subtract the units.
9. 9. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 40 6 Followed by the tens
10. 10. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ And finishing with the hundreds: 60 70 15 5 200 20 9 200 40 6
11. 11. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 The 3 answers are then added together to give the final answer
12. 12. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 When this can be performed confidently, it can be simplified to a standard written method: 4 7 5 _ 2 2 9
13. 13. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 When this can be performed confidently, it can be simplified to a standard written method: 6 4 7 5 _ 2 2 9 Firstly, an adjustment is made from the tens
14. 14. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 When this can be performed confidently, it can be simplified to a standard written method: 6 15 4 7 5 _ 2 2 9 Firstly, an adjustment is made from the tens to the units
15. 15. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 When this can be performed confidently, it can be simplified to a standard written method: 6 15 4 7 5 _ 2 2 9 6 Then subtract the units
16. 16. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 When this can be performed confidently, it can be simplified to a standard written method: 6 15 4 7 5 _ 2 2 9 4 6 Followed by the tens
17. 17. When subtracting, there will be times when the units in the bigger number are smaller than the units in the smaller number, e.g. 475 – 229 When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column. And added to the units column. 400 _ 60 70 15 5 200 20 9 200 + 40 + 6 = 246 When this can be performed confidently, it can be simplified to a standard written method: 6 15 4 7 5 _ 2 2 9 2 4 6 And finally the hundreds
18. 18. That’s it for now...... For more help with your maths, try my book: mastering multiplication tables on amazon.com