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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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Score

There are exactly 3 ways to add 4 odd numbers to get 10. Find all the ways of adding 8 odd numbers to get 20. To be sure of getting all the solutions you will need to be systematic. What about a total of 15 with 6 odd numbers?

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Medal Muddle

Countries from across the world competed in a sports tournament. Can you devise an efficient strategy to work out the order in which they finished?

Pattern of Islands

Age 11 to 14 Challenge Level:

How many ways can you arrange the bridges if the islands with two bridges all connect to each other?

What if one two-bridge island connects to the other two, but they are not joined to each other?

How else could you connect the two-bridge islands?