Mathigon has appeared on this blog from time to time, most notably on my post, “15 Math Sites that Won’t Make You Fall Asleep,” because of its visually engaging math activities. In the past few years, the site has offered a puzzle calendar with 24 different challenges every December, only one of which can be opened each day. Solutions are given the subsequent days, but you will need to log in (it’s free to register) to see them. If you prefer to pick and choose among puzzles, the puzzles from 2017-2019 are available by clicking on the tabs at the top of the page – great for challenging your advanced students or looking for specific math problems that will support what you might be currently covering in your curriculum.

Since Mathigon’s puzzle calendar is basically a mathematical Advent calendar, I will be adding this post to my Winter Holiday Wakelet. Check it out for some more fun activities to do this December!