Subtract 1 or 2 less than a multip of 10
Subtract 1 or 2 less than a multip of 10
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2.NBT.7
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Use multiples of 10 as a benchmark to subtract 2-digit numbers ending in 8 or 9, e.g.
170 - 50 = 120, so 170 - 49 is 1 more than 120.
360 - 40 = 320, so 360 - 38 is 2 more than 320.