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Number Round Up

Age 5 to 7
Challenge Level

Well done to everybody who had a go at this activity. We only had a couple of solutions sent in, so please email us if you have any more ideas about how to solve these triangles.

Penny from Hillbrook Primary School in the UK sent in this solution:

Good ideas, Penny! I wonder why it's easier if you pair the big numbers with the small numbers, and put the medium numbers together?