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Multiplication Mistake

Age 11 to 14 Short Challenge Level:

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 the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
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