Common Core State Standards for Math
2.NBT.B.5
6b9cbaef-d7cc-11e8-824f-0242ac160002 6b9ddc4d-d7cc-11e8-824f-0242ac160002 6b9cd3d1-d7cc-11e8-824f-0242ac160002 2.NBT.B 2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
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