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Traffic Lights
The game uses a 3x3 square board. 2 players take turns to play, either placing a red on an empty square, or changing a red to orange, or orange to green. The player who forms 3 of 1 colour in a line wins.
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.
Age 5 to 14
Challenge Level
A tangram is an ancient Chinese puzzle where you make pictures using mathematical shapes.
Make a set of tangram pieces from squared paper as shown below:
Can you make each of these pictures using your seven pieces?
You can try some more tangram puzzles in the World of Tan problems.
There are puzzles using a different set of tangram shapes in the problem Square Tangram.
Or why not try designing some Tangram pictures of your own?
If you want to learn how to make a tangram, click here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.