Common Core State Standards for Math

1.OA.B.4

6b9cbaef-d7cc-11e8-824f-0242ac160002 6b9ccf1c-d7cc-11e8-824f-0242ac160002 6b9b1433-d7cc-11e8-824f-0242ac160002 1.OA.B 1.OA.B.4

Understand subtraction as an unknown-addend problem. <em>For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.</em>

Propose a mapping

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