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Five children are taking part in a climbing competition with three parts, where their score for each part will be multiplied together. Can you see how the leaderboard will change depending on what happens in the final climb of the competition?

How many solutions can you find to this sum? Each of the different letters stands for a different number.

How much can you read into a T-shirt?

Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?

If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?

In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

How much of the square is coloured blue? How will the pattern continue?