When is National Pi Day 2025? What to know about Pi Day activities for kids, songs, movies, jokes, deals, snack ideas and more.

Pi belongs to a huge mathematical group called irrational numbers, which go on forever and cannot be written as fractions.

Math fanatics from all around the world and everyone else who just loves ancient Greek pi (or pie) celebrate on March 14.

Several national retailers are offering Pi Day discounts and special deals on March 14 to celebrate the mathematical holiday.

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