It is possible to identify a particular card out of a pack of 15 with the use of some mathematical reasoning. What is this reasoning and can it be applied to other numbers of cards?

Discover a handy way to describe reorderings and solve our anagram in the process.

The binary operation * for combining sets is defined as the union of two sets minus their intersection. Prove the set of all subsets of a set S together with the binary operation * forms a group.

Explore the properties of some groups such as: The set of all real numbers excluding -1 together with the operation x*y = xy + x + y. Find the identity and the inverse of the element x.

Show that the infinite set of finite (or terminating) binary sequences can be written as an ordered list whereas the infinite set of all infinite binary sequences cannot.

Curt from Reigate College explains very well why this graph has a symmetrical pitchfork shape.

An introduction to the sort of algebra studied at university, focussing on groups.

Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?