subtraction using an expanded method (part 3 of 5)
Post on 23-Jun-2015
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Subtraction Of Whole Numbers Using An Expanded Method
(the last step towards using a standard written method for subtraction)
For more maths help & free games related to this, visit: www.makemymathsbetter.com
Part 3 of 5: Subtraction with adjustment from the tens.
Subtraction Of Whole Numbers Using An Expanded Method
(the last step towards using a standard written method for subtraction)
For more maths help & free games related to this, visit: www.makemymathsbetter.com
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.
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
200
70
20
5
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 – 229When this happens, an adjustment is made from the tens to the units.
400
200
70
20
5
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 – 229When this happens, an adjustment is made from the tens to the units. A ten is effectively taken from the tens column.
400
200
70
20
5
9_
60
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 – 229When 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
200
70
20
5
9_
60 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 – 229When 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
200
70
20
5
9_
60The calculation can then be carried out:
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 – 229When 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
200
70
20
5
9_
6
60 15
Firstly, subtract the units.
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 – 229When 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
200
70
20
5
9_
640
60 15
Followed by the tens
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 – 229When 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
200
70
20
5
9_
640200
60
And finishing with the hundreds:
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 – 229When 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
200
70
20
5
9_
640200 + + = 246
60 15
The 3 answers are then added together to give the final answer
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 – 229When 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.
When this can be performed confidently, it can be simplified to a standard written method:
400
200
70
20
5
9_
640200 + + = 246
60
4 7 5
2 2 9_
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 – 229When 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.
When this can be performed confidently, it can be simplified to a standard written method:
400
200
70
20
5
9_
640200 + + = 246
60
4 7 5
2 2 9_
6
15
Firstly, an adjustment is made from the tens
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 – 229When 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.
When this can be performed confidently, it can be simplified to a standard written method:
400
200
70
20
5
9_
640200 + + = 246
60
4 7 5
2 2 9_
156
15
Firstly, an adjustment is made from the tens to the units
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 – 229When 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.
When this can be performed confidently, it can be simplified to a standard written method:
400
200
70
20
5
9_
640200 + + = 246
60
4 7 5
2 2 9_
6
156
15
Then subtract the units
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 – 229When 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.
When this can be performed confidently, it can be simplified to a standard written method:
400
200
70
20
5
9_
640200 + + = 246
60
4 7 5
2 2 9_
4 6
156
15
Followed by the tens
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 – 229When 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.
When this can be performed confidently, it can be simplified to a standard written method:
400
200
70
20
5
9_
640200 + + = 246
60
4 7 5
2 2 9_
2 4 6
156
15
And finally the hundreds
That’s it for now......
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mastering multiplication tableson amazon.com
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