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'Sort Them Out (1)' printed from http://nrich.maths.org/
It's best to do this with $3$ other friends. You can get copies of these cards here .doc .pdf
Share all the cards out equally among the four of you.
Work out what the answer is to each question on your cards.
Do you notice anything?
What do you notice?
Try sorting or arranging the cards in some way.