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You could print out this sheet to use instead of copying the network out.
Which number will you have to end on?
You could make a list of the numbers and cross them out as you use them.

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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.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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