Subtract 1 more/less than a mult of 10

8 Subtract 1 more or 1 less than a multiple of 10.png
8 Subtract 1 more or 1 less than a multiple of 10.png

Subtract 1 more/less than a mult of 10

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About This Sprint

Use multiples of 10 as benchmarks to subtract 2-digit numbers with 1 or 9 in the ones place, e.g.

73 - 30 = 43

73 - 31 is one less than 43

73 - 29 is one more than 43