problem How much can we spend? Age 11 to 14 Challenge level A country has decided to have just two different coins, 3z and 5z coins. Which totals can be made? Is there a largest total that cannot be made? How do you know?
problem Nice or Nasty Age 7 to 14 Challenge level There are nasty versions of this dice game but we'll start with the nice ones...
problem Coded hundred square Age 7 to 11 Challenge level This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
problem Baravelle Age 7 to 16 Challenge level What can you see? What do you notice? What questions can you ask?
problem Treasure Hunt Age 7 to 14 Challenge level Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?
problem Eight hidden squares Age 7 to 14 Challenge level On the graph there are 28 marked points. These points all mark the vertices (corners) of eight hidden squares. Can you find the eight hidden squares?
problem Magic Vs Age 7 to 11 Challenge level Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
problem m, m and m Age 11 to 14 Challenge level If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?
problem Repeating Patterns Age 5 to 7 Challenge level Try continuing these patterns made from triangles. Can you create your own repeating pattern?
problem Cows and Sheep Age 7 to 11 Challenge level Use your logical reasoning to work out how many cows and how many sheep there are in each field.