Common Core State Standards for Math

1.NBT.C.5

6b9cbaef-d7cc-11e8-824f-0242ac160002 6b9ccf1c-d7cc-11e8-824f-0242ac160002 6b9cd178-d7cc-11e8-824f-0242ac160002 1.NBT.C 1.NBT.C.5

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

Propose a mapping

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