# Paper sizes

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**Description: **Pupils investigate paper sizes in the A and B international series. They can explore the relationships within each series and between the series. If pupils access information on paper sizes on the web, the focus of their work will need to be on interpreting and explaining their research.

**Suitability:** Pupils working at all levels;individuals or pairs.

**Time:** 1–2 hours

**Equipment:** 1 sheet of each of A3, A4, A5, B5 and B6 paper, labelled appropriately. Rulers Sticky tape, scissors

**Key mathematical language:** Dimension, length, width, area, measurement, centimetre, millimetre, double, half, ratio, proportion, scaling, surd, series, similar, congruent, upper bound, lower bound