Subtract 1 or 2 less than a multip of 10

9Subtract 1 or 2 more or less than a 2-digit multiple of 10.png
9Subtract 1 or 2 more or less than a 2-digit multiple of 10.png

Subtract 1 or 2 less than a multip of 10

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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.