10, 26, 42, 34, 28, 22, 21,
45, 18, 33, 4, 25, 32, 14,
12, 20, 7, 13, 36, 8, 38.
Most of the numbers in the list above can be added to another number in the list to give a sum of 46. Which numbers do not have a partner?
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Topics: Starter  Arithmetic  Mental Methods
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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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