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Measure for Measure

This article, written for students, looks at how some measuring units and devices were developed.

Sizing Them Up

Can you put these shapes in order of size? Start with the smallest.

Cutting it Out

I cut this square into two different shapes. What can you say about the relationship between them?

Hand Span

Age 5 to 7
Challenge Level

Harriet tried this problem out:

My hand's not as big as my mum's, so it took more spans to go round the tree. So if I told you how big the tree was, you might think that it was bigger than if my mum told you. So it's better to use a tape measure and use centimetres or something because then we'll all give the same answer.
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.