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A couple videos to help explain how we teach some of the methods in maths.
Exchanging is when the top digit is smaller than the bottom digit and would result in a negative number. Instead we take it from the next column (this is explained better in the next video- apologies for the mistake where I say the top number is *bigger* in this video!)
For example: 345
- 227 345 is clearly bigger than 227 but 5 - 7 would give us a negative number, so we need to exchange.
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