Add 1 more or less than a multiple of 10

13Add 1 more or 1 less than a multiple of 10 within 100.png
13Add 1 more or 1 less than a multiple of 10 within 100.png

Add 1 more or less than a multiple of 10

0.99

2.NBT.5

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Additional Information

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

37 + 20 = 57

37 + 21 is one more than 57

37 + 19 is one less than 57