problem Oranges and Lemons, say the bells of St Clement's Age 11 to 14 Challenge level Bellringers have a special way to write down the patterns they ring. Learn about these patterns and draw some of your own.
problem Sticks and Triangles Age 7 to 11 Challenge level Using different numbers of sticks, how many different triangles are you able to make? Can you make any rules about the numbers of sticks that make the most triangles?
problem Coordinate Challenge Age 7 to 11 Challenge level Use the clues about the symmetrical properties of these letters to place them on the grid.
problem So Many Sums Age 11 to 14 Challenge level In this addition each letter stands for a different digit, with S standing for 3. What is the value of YxO?
problem Intersection Sums Sudoku Age 7 to 16 Challenge level A Sudoku with clues given as sums of entries.
problem Fly Away Age 11 to 14 Challenge level Can you work out the values of the digits in this addition sum?
problem Making 11p Age 11 to 14 Challenge level How many ways are there to make 11p using 1p, 2p and 5p coins?
problem Four-Triangle Arrangements Age 5 to 7 Challenge level How many different shapes can you make by putting four right- angled isosceles triangles together?
problem Diagonal Sums Sudoku Age 7 to 16 Challenge level Solve this Sudoku puzzle whose clues are in the form of sums of the numbers which should appear in diagonal opposite cells.