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Prerequisites

Prime numbers and prime factorisation

With thanks to Frances, whose Criba d’Erastòstenes worksheet is available here. Material modified and embedded here under the CC-BY-SA 3.0 license.

Teacher resources

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Worksheet (with space for student work)
Handout (slides with exercises only; 4 per page for reduced printing)
- Worked solutions to all questions

Links to past exam and UKMT questions

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Unlimited practice questions on prime factor decomposition

In the real world

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