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'Finding Fifteen' printed from http://nrich.maths.org/

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Tim had nine cards, each with a different number from 1 to 9 on it.
He put the cards into three piles so that the total in each pile was 15.
How could he have done this?

Can you find all the different ways Tim could have done this?

You may like to print off and cut out these digit cards to help you.