International Day of Mathematics (IDM) is celebrated around the world every year on March 14th. March 14th was chosen as the date for IDM because it was already celebrated in many countries as Π day. The International Day of Mathematics project was initiated by the International mathematical union with support from numerous international and regional organizations from all over the world. 14.3. was declared the International Day of Mathematics at the 40th UNESCO general session on November 26, 2019, and was first celebrated on March 14th, 2020.

All countries are invited to participate in activities for students and the general public in schools, through activities in museums, libraries, etc. Each year a theme is determined (which has nothing to do with the number Π) and promotional materials are designed, as well as ideas for activities. “Mathematics for everyone” is a topic for the year 2023.
In addition to the common topic, all participants are invited to participate in one challenge, which changes from year to year. All information and materials are available on the website https://www.idm314.org/.

Through the website, institutions have the option to register their own activities and thus appear on the map of all institutions that joined the International Day of Mathematics.

We suggest some of the activities that can be held in classrooms in the article “Međunarodni dan matematiku u Pi ritmu”, published in the journal MIŠ: Matematika i Škola.