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Polydron

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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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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?

Symmetrical Semaphore

Stage: 2 Challenge Level: Challenge Level:1

Which of the signals would look the same from the front and the back?
Can you find pairs of signals that 'match' when seen from in front or behind?
What about the order in which the signals are sent? Do they matter?