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Counting Trees 1.How many text messages are sent if four people all send messages to each other? 2.How many text messages are sent with different numbers of people? 3.Approximately how many text messages would travel in cyberspace if everyone in your school took part? 4.Can you think of other situations that would give rise to the same mathematical relationship?

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Counting Trees Follow-up task for students Look carefully at the following extracts of work from other students. Imagine you are their teacher. Go through each piece of work and write comments on each one. Have they chosen a sensible method? Are the calculations correct? Are the conclusions sensible? Is the work easy to understand?

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Counting Trees Tom’s answer

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Counting Trees Sam’s answer

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Counting Trees Chris’s answer

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Counting Trees Lily’s answer

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Counting Trees Marvin’s answer

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