How many numbers below are factors of other numbers in the table?
How many numbers above are multiples of other numbers in the table?
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Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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Teacher, do your students have
access to computers?
Here a concise URL for a version of this page without the comments.
While factors are in mind follow this URL to a student version of the Sieve of Eratosthenes.
See the National Curriculum page for links to related online activities and resources.