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'Sort Them Out (2)' printed from http://nrich.maths.org/
This challenge is best done in a group of at least four and preferably more.
You'll need to print out this sheet
cut into fifteen separate cards.
Share the cards out amongst the group.
Can you each work out the number on your card? What do you notice?
How could you sort the cards?
You may like to try using this sheet
of twenty cards in the same way, which contain slightly harder questions.