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Note to teacher: Doing this activity once with a class helps students develop strategies. There is a very quick method for doing this calculation! It is only when they do this activity a second time that they will have the opportunity to practise their strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from a random number.
Teacher, do your students have
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The famous Mathematician Carl Gauss found a quick way to perform this type of
calculation when he was a boy; a long time before calculators!
Students could search the web for details of this story.