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?

It's like 'Peaches Today, Peaches Tomorrow' but interestingly generalized.

What day of the week were you born on? Do you know? Here's a way to find out.

However did we manage before calculators? Is there an efficient way to do a square root if you have to do the work yourself?

Investigate circuits and record your findings in this simple introduction to truth tables and logic.

Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.