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Eight Dominoes

Using the 8 dominoes make a square where each of the columns and rows adds up to 8

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Each of these solids is made up with 3 squares and a triangle around each vertex. Each has a total of 18 square faces and 8 faces that are equilateral triangles. How many faces, edges and vertices does each solid have?

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Prime Magic

Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?

Shady Symmetry

Age 11 to 14 Challenge Level:
Begin by looking at all the patterns that can be made by first colouring in just one cell, then two, then three and so on.