Multiplication and division are ___ operations.

inverse (opposite) — They undo each other: 12 × 12 = 144 and 144 ÷ 12 = 12. That makes them inverse (opposite) operations.

JOMKELAS

Chapter 1

Whole Numbers and Operations

Larger whole numbers and the four operations — bigger multiplication and division, inverse operations, and estimating to check — with an interactive exercise.

In Year 4 we use larger whole numbers and the four basic operations with them.

Multiplication and division get bigger: 45 × 3 = 135, and 144 ÷ 12 = 12. Estimating first helps you check your work.

Remember

Line up place values before adding or subtracting.
Multiplication and division are opposite (inverse) operations.

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