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Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?

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Dotty Six is a simple dice game that you can adapt in many ways.

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These eleven shapes each stand for a different number. Can you use the number sentences to work out what they are?

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Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?

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In this game for two players, the idea is to take it in turns to choose 1, 3, 5 or 7. The winner is the first to make the total 37.

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Use your logical reasoning to work out how many cows and how many sheep there are in each field.

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Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?

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Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?

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This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?

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Sally and Ben were drawing shapes in chalk on the school playground. Can you work out what shapes each of them drew using the clues?

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Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.

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There are nasty versions of this dice game but we'll start with the nice ones...

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Play this game and see if you can figure out the computer's chosen number.

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Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

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Four bags contain a large number of 1s, 3s, 5s and 7s. Pick any ten numbers from the bags above so that their total is 37.

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Who said that adding, subtracting, multiplying and dividing couldn't be fun?

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