Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?

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

Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?

Use your logical-thinking skills to deduce how much Dan's crisps and ice-cream cost altogether.

Using the statements, can you work out how many of each type of rabbit there are in these pens?

The flow chart requires two numbers, M and N. Select several values for M and try to establish what the flow chart does.

Four friends must cross a bridge. How can they all cross it in just 17 minutes?

A man has 5 coins in his pocket. Given the clues, can you work out what the coins are?

Can you set the logic gates so that the number of bulbs which are on is the same as the number of switches which are on?

Using balancing scales what is the least number of weights needed to weigh all integer masses from 1 to 1000? Placing some of the weights in the same pan as the object how many are needed?

Rhea compared the triangles very thoroughly and noticed that they have the same areas.

Most stories about the history of maths seem to be about men. Here are some famous women who contributed to the development of modern maths and prepared the way for generations of female mathematicians.