Resources
On Monday you are introduced to expanded column subtraction. I wouldn’t necessary teach this particularly method but it is helpful in seeing what is going on when you subtract a smaller 3-digit number from a larger one. This is how I would work out the example given.
782 – 467
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H |
T |
U |
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7 |
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12 |
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4 |
6 |
7 |
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3 |
1 |
5 |
- |
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It is doing exacting the same by ‘borrowing’ a ten and combing it with the two ones to make twelve.
These websites are worth a look:
How to use column subtraction (BBC Bitesize)
How to work out an area (BBC Bitesize)
What is area? (Maths is Fun)
Rectangles (Maths is Fun)
Calculating Area (BBC Bitesize daily lessons)