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National Council of Teachers of Mathematics
The Math Forum: Pi Day
Need some ideas for Pi Day on March 14th? You can get some great resources at this location. There are all kinds of links available.
Ducksters
Ducksters: Holidays for Kids: Pi Day
Kids learn about Pi Day. The history and facts about this holiday which celebrates math and the number pi.
Math Is Fun
Math Is Fun: Pi
Explains what Pi is and how it is calculated. Gives suggestions for how to calculate it yourself and a tip for remembering it to nine decimal places. Includes a set of practice questions.