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Subtraction Using An Expanded Method (part 4 of 5)

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Subtraction Using An Expanded Method (part 4 of 5)

1. 1. Subtraction Of Whole Numbers Using An Expanded Method (the last step towards using a standard written method for subtraction) Part 4 of 5: Subtraction with adjustment from the tens and 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 4 of 5: Subtraction with adjustment from the tens and the hundreds. It is important that you have already viewed and understood parts 1, 2 & 3 before you go any further. For more maths help & free games related to this, visit: www.makemymathsbetter.com
3. 3. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 600 _ 40 5 300 70 8
4. 4. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. An adjustment will first need to be made from the tens 600 _ 30 40 5 300 70 8
5. 5. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. An adjustment will first need to be made from the tens to the units 600 _ 30 40 15 5 300 70 8
6. 6. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. An adjustment will first need to be made from the tens to the units. The units can then be subtracted: 600 _ 30 40 15 5 300 70 8 7
7. 7. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. An adjustment then needs to be made from the hundreds 500 600 _ 30 40 15 5 300 70 8 7
8. 8. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. An adjustment then needs to be made from the hundreds to the tens 500 600 _ 130 30 40 15 5 300 70 8 7
9. 9. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. An adjustment then needs to be made from the hundreds to the tens. The tens can then be subtracted: 130 500 30 15 600 40 5 _ 300 70 8 60 7
10. 10. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. Finally subtract the hundreds: 500 600 _ 130 30 40 15 5 300 70 8 200 60 7
11. 11. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 Then add the numbers together to find the answer = 267
12. 12. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 6 4 5 _ 3 7 8
13. 13. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 3 6 4 5 _ 3 7 8 Firstly an adjustment is made from the tens
14. 14. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 3 15 6 4 5 _ 3 7 8 Firstly an adjustment is made from the tens to the units.
15. 15. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 3 15 6 4 5 _ 3 7 8 7 Firstly an adjustment is made from the tens to the units. Then, the units are subtracted
16. 16. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 5 3 15 6 4 5 _ 3 7 8 7 Next, an adjustment is made from the hundreds
17. 17. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 5 13 3 15 6 4 5 _ 3 7 8 7 Next, an adjustment is made from the hundreds to the tens
18. 18. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 5 13 3 15 6 4 5 _ 3 7 8 6 7 Next, an adjustment is made from the hundreds to the tens. The tens are then subtracted.
19. 19. In some subtraction questions both the tens and the units digits to be subtracted are bigger than both the tens and the units digits you are subtracting from, for example: 645 - 378. 500 600 _ 130 30 40 15 5 300 70 8 200 + 60 + 7 = 267 When this can be performed confidently, it can be simplified to a standard written method: 5 13 3 15 6 4 5 _ 3 7 8 2 6 7 Finally the hundreds are subtracted.
20. 20. That’s it for now...... For more help with your maths, try my book: mastering multiplication tables on amazon.com