Grade 2 · Math · Lesson 13

Check Answers Using Inverse Operations

An inverse operation is the opposite operation. Addition and subtraction are inverses of each other — one undoes the other. This lets you check your work without re-doing the same sum.

What this lesson teaches

1Explain that addition and subtraction undo each other
2Write the inverse subtraction for any addition equation
3Use the inverse operation to check an answer is correct

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