problem Taking Steps Age 7 to 11 Challenge level In each of the pictures the invitation is for you to: Count what you see. Identify how you think the pattern would continue.
problem Archimedes and numerical roots Age 14 to 16 Challenge level The problem is how did Archimedes calculate the lengths of the sides of the polygons which needed him to be able to calculate square roots?
problem Farey Sequences Age 11 to 14 Challenge level There are lots of ideas to explore in these sequences of ordered fractions.
problem Beads Age 7 to 11 Challenge level Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
problem Even Up Age 11 to 14 Challenge level Consider all of the five digit numbers which we can form using only the digits 2, 4, 6 and 8. If these numbers are arranged in ascending order, what is the 512th number?
problem Sept03 Sept03 Sept03 Age 7 to 11 Challenge level This number has 903 digits. What is the sum of all 903 digits?
problem Frogs Age 11 to 14 Challenge level How many moves does it take to swap over some red and blue frogs? Do you have a method?
problem Sets of Numbers Age 7 to 11 Challenge level How many different sets of numbers with at least four members can you find in the numbers in this box?