Subtracting 2-digits by counting up

Sometimes it's easier to do subtraction by counting up, especially if the numbers are close to each other.

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practice at subtracting 11 or 21 from 2-digit numbers 'in your head'.

Using mental methods to subtract 19 from 2-digit numbers.

Subtract multiples of ten, up to 100.

Subtracting multiples of 10 from any 2-digit numbers

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