Match the cards with the same value.
Keep an eye on your score - ending at around 400 would be an excellent score.
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To download a printable version of this game, use the links below. There are three sets - set A is the easiest and set C is the most difficult.
If you print double sided, then the cards will have an NRICH logo on the back. Otherwise, you can just print the first page.
Set A, Set B, Set C