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Standards/Math/Northern Mariana Islands/1.NBT.C.5

1.NBT.C.5

1.NBT.C Use place value understanding and properties of operations to add and subtract.
1.NBT.C.4
1.NBT.C.5
1.NBT.C.6

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Khan Academy Resources
Add 1 or 10Adding 1 vs. adding 10
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