NRICH: Multiplication Mistake Age

Jane accidentally multiplied by 54 instead of 45, and her answer was 198 too big. What number did she multiply 54 by?

Jane made a mistake when writing down a multiplication, and she multiplied by 54 instead of 45.

Her answer was 198 more than it should have been.

What number did she multiply 54 by?

This problem is adapted from theĀ World Mathematics Championships

You can find more short problems, arranged by curriculum topic, in ourĀ short problems collection.

11 to 14


Algebra & Pre-Algebra, Equations
Middle School, High School

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NRICH (University of Cambridge)

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