Countdown to Christmas with our mathematical Advent calendars!

Share in the festive spirit with our annual NRICH and Plus mathematical Advent calendars! NRICH has published two online Advent calendars, one for primary students (ages 5 to 11) and one for secondary. Both are filled with 24 of our favourite short problems, one for every day in the run up to Christmas. And as an extra present (because we know all our NRICH readers have been very, very good), our Primary calendar this year also includes a downloadable seasonal picture for you to colour in! Meanwhile for the grown-ups, there's nothing we like more than a bit of fascinating maths, explained by a fascinating mathematician, so this year's Plus Advent calendar presents an assortment of our favourite videos from Plus, our online popular mathematics magazine. Curl up with with your mince pies and mulled wine and start watching!