Working systematically

This tricky challenge asks you to find ways of going across rectangles, going through exactly ten squares.

Can you crack these very difficult challenge ciphers? How might you systematise the cracking of unknown ciphers?

Advent Calendar 2011 - a mathematical activity for each day during the run-up to Christmas.

A challenging activity focusing on finding all possible ways of stacking rods.

In how many ways can you stack these rods, following the rules?

This challenging activity involves finding different ways to distribute fifteen items among four sets, when the sets must include three, four, five and six items.

Can you use the information to find out which cards I have used?

This challenge extends the Plants investigation so now four or more children are involved.

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?