Fractional Triangles
Age 7 to 11
Challenge Level
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Nine-pin Triangles
Age 7 to 11
Challenge Level
How many different triangles can you make on a circular pegboard that has nine pegs?
Cut Nets
Age 7 to 11
Challenge Level
Each of the nets of nine solid shapes has been cut into two pieces. Can you see which pieces go together?
Eight Hidden Squares
Age 7 to 14
Challenge Level
On the graph there are 28 marked points. These points all mark the vertices (corners) of eight hidden squares. Can you find the eight hidden squares?
Ten Hidden Squares
Age 7 to 14
Challenge Level
These points all mark the vertices (corners) of ten hidden squares. Can you find the 10 hidden squares?
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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.