Secondary Toughnutslive
Age 11 to 18 Challenge Level:
These secondary problems have not yet been solved. Can you be the first?
Quad in Quadlive
Age 14 to 16 Challenge Level:
Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?
Semi-regular Tessellationslive
Age 11 to 16 Challenge Level:
Semi-regular tessellations combine two or more different regular polygons to fill the plane. Can you find all the semi-regular tessellations?
Shifting Times Tableslive
Age 11 to 14 Challenge Level:
Can you find a way to identify times tables after they have been shifted up or down?
Polygon Ringslive
Age 11 to 14 Challenge Level:
Join pentagons together edge to edge. Will they form a ring?
Surprising Equalitieslive
Age 14 to 18 Challenge Level:
Take any triangle, and construct squares on each sides. What do you notice about the areas of the new triangles formed?
Pentagon Constructionlive
Age 16 to 18 Challenge Level:
Follow the instructions to create a regular pentagon. Can you prove it is indeed regular?
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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.