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### Number and algebra

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# Hand Span

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.

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Age 5 to 7

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

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.

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

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