See also: Matching titles (21)

20 problems, 1 game, 11 articles, 33 general resources, 6 Lists, 24 from Stage 1, 47 from Stage 2, 28 from Stage 3, 19 from Stage 4, 7 from Stage 5

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

Advent Calendar 2012 - a mathematical activity for each day during the run-up to Christmas.

All the activities in the 2013 advent calendar are based on the theme of planet earth.

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

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

Enjoy a video each day in the run up to Christmas with our Secondary Advent Calendar!

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

All the activities in this year's primary Advent Calendar have a food or drink theme. Yum yum!

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

NRICH December 2006 advent calendar - a new tangram for each day in 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".

A collection of our favourite pictorial problems, one for each day of Advent.

The 2012 primary advent calendar features twenty-four of our posters, one for each day in the run-up to Christmas.

A mathematical challenge for each day during the run-up to Christmas.

Explore a task from our Wild site on each day in the run up to Christmas

Twenty-four tasks for the run-up to Christmas.

This advent calendar contains twenty-four tasks for the run-up to Christmas, each one encouraging mathematical creativity.

Twenty-four tasks for the run-up to Christmas, each one encouraging you to develop mathematical 'habits of mind'.

Can you make the birds from the egg tangram?

Calendars were one of the earliest calculating devices developed by civilizations. Find out about the Mayan calendar in this article.

Make some celtic knot patterns using tiling techniques

Can you recreate this Indian screen pattern? Can you make up similar patterns of your own?

Make an equilateral triangle by folding paper and use it to make patterns of your own.

Paint a stripe on a cardboard roll. Can you predict what will happen when it is rolled across a sheet of paper?

In this section from a calendar, put a square box around the 1st, 2nd, 8th and 9th. Add all the pairs of numbers. What do you notice about the answers?

It might seem impossible but it is possible. How can you cut a playing card to make a hole big enough to walk through?

Don't get rid of your old calendars! You can get a lot more mathematical mileage out of them before they are thrown away. These activities, using cut up dates from the calendar, provide numbers to. . . .

Make a pair of cubes that can be moved to show all the days of the month from the 1st to the 31st.

It's hard to make a snowflake with six perfect lines of symmetry, but it's fun to try!

Have you noticed that triangles are used in manmade structures? Perhaps there is a good reason for this? 'Test a Triangle' and see how rigid triangles are.

Choose any three by three square of dates on a calendar page...

Make a cube with three strips of paper. Colour three faces or use the numbers 1 to 6 to make a die.

Have a go at drawing these stars which use six points drawn around a circle. Perhaps you can create your own designs?

Make a mobius band and investigate its properties.

You could use just coloured pencils and paper to create this design, but it will be more eye-catching if you can get hold of hammer, nails and string.

Galileo, a famous inventor who lived about 400 years ago, came up with an idea similar to this for making a time measuring instrument. Can you turn your pendulum into an accurate minute timer?

Try adding together the dates of all the days in one week. Now multiply the first date by 7 and add 21. Can you explain what happens?

Follow these instructions to make a five-pointed snowflake from a square of paper.

Using these kite and dart templates, you could try to recreate part of Penrose's famous tessellation or design one yourself.

Try these treasures to celebrate NRICH's 20th birthday

Surprise your friends with this magic square trick.

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