Advent Calendar 2011 - a mathematical activity for each day during the run-up to Christmas.
NRICH 2011 Primary Advent Calendar
Rather than using the numbers 1-9, this sudoku uses the nine different letters used to make the words "Advent Calendar".
Advent Calendar 2010 - a mathematical game for every day during the run-up to Christmas.
The pages of my calendar have got mixed up. Can you sort them out?
2016 Secondary Advent Calendar
Mathematicians are always looking for efficient methods for solving problems. How efficient can you be?