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

Rather than using the numbers 1-9, this sudoku uses the nine different letters used to make the words "Advent Calendar".

Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.

Advent Calendar 2010 - a mathematical game for every day during the run-up to Christmas.

Advent Calendar 2010 - a mathematical game for every day during the run-up to Christmas.

NRICH December 2007 advent calendar - a new Sudoku for each day in the run-up to Christmas.

The pages of my calendar have got mixed up. Can you sort them out?

Mathematicians are always looking for efficient methods for solving problems. How efficient can you be?

Can you fit the tangram pieces into the outline of Little Ming?