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Yih or Luk Tsut K'i or Three Men's Morris

Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots and a little about prime knots, crossing numbers and knot arithmetic.

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Lambs and Tigers

Investigations based on an Indian game.

Matching Fractions Decimals Percentages

Stage: 2 and 3 Challenge Level: Challenge Level:1
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 are the easiest and set C are 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.

PDF: Set A, Set B, Set C

Word: Set A, Set B, Set C