Pupils measure the trunks of eight trees, record the results and then answer questions on their own data, including averages.

**How it runs
**
Start with the problem: how do you measure round a tree trunk? Most classes reach string as the answer.
In pairs, pupils measure eight trunks, either marking the string or measuring it after each trunk, and fill in the results table.
Back at their desks, they answer the question sheet. The easier sheet asks straightforward questions about the data; the harder sheet focuses on finding averages.
It suits Years 3–6, and links to Year 6 circles and averages. It takes 40–60 minutes, with string and tape measures as the only kit.

In the download: teacher guide, two results tables and two question sheets (each at two levels).

By Educate Outside, outdoor learning specialists.

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