Challenge Level

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

Challenge Level

This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

Challenge Level

Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?

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

Challenge Level

Take three consecutive numbers and add them together. What do you notice?

Challenge Level

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