St Andrew's C of E (VA) Primary

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Subtraction

 In Year 2 we have been finding the most efficient strategy in order to subtract a two digit number from a two digit number. We have been using our 'friendly numbers' which are multiples of five and ten in order to help our efficiency.
For example,
43-29=?
43-3=40
40-20=20
20-6=14
or
43-29=?
43-20=23
23-3=20
20-6=14