Subtracting 9

Today we are going to look at a quick way that you can subtract 9 from a 2-digit number.

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Subtracting 9 by subtracting 10 and adding 1.

Some excellent mental arithmetic work on subtracting a single digit from a 2-digit number.

Quite tricky subtraction: taking a single digit from a multiple of 10.

Today we are going to look at a quick way that you can add 9 to a number.

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