CHECKING WITH INVERSE OPERATIONS

Use the opposite operation to check if your answer is correct.

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CS.N.3.6·Relationship between multiplication and division(III)CS.N.4.3·Estimating and verifying results(IV)

Section 1 / 3

EVERY OPERATION HAS AN OPPOSITE

Addition and subtraction undo each other, and so do multiplication and division. That gives you a way to check any answer yourself, without asking anyone.

Check: 47 + 38 = 85?

1Use inverse: 85 − 38 = ?

285 − 38 = 47 ✓

3Correct!

= 85

LEADER TIP

Make 'check your answer' a non-negotiable step. Inverse operations catch most arithmetic errors.

BEFORE THIS LESSON, TRY

Inverse Multiplication

PRACTICE WITH THESE GAMES

Expression Compare

Equation Builder

Find the Operation

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CHECKING WITH INVERSE OPERATIONS

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CHECKING WITH INVERSE OPERATIONS