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Reasoned Rounding

Four strategy dice games to consolidate pupils' understanding of rounding.

Rough Rectangle

Age 11 to 14 Short Challenge Level:

The length of a rectangle is 6 cm and its width is 5 cm, both correct to the nearest centimetre.

What is the smallest possible area the rectangle could have?


This problem is taken 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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NRICH is part of the family of activities in the Millennium Mathematics Project.