Have you heard? March 14 is Pi day!

Not sure what Pi is? Pi is a number used to represent the ratio of a circle’s circumference and diameter and is often approximated to 3.14. However, Pi is actually an irrational number that goes on and on forever. It never ends! Check out the bottom of this page to see many digits of pi.

Calculate pi

Now let’s celebrate this amazing number on March 14 with these Pi day activities:

1) Find circles or cylinders around the house or school and measure their diameter and circumference with a measuring tape. Divide each circle’s circumference by its diameter.  How close did you get to 3.14? Collect a lot of calculations. Calculate the average. Now how close did you get to pi?

2) Plan menus to include circular foods such as  pancakes, pies, cookies, casseroles, etc.

3) Hold a contest to see who can recite the most digits of pi.

4) Read any of the books in the Sir Cumference series by Cindy Neuschwander. I especially like Sir Cumference and the First Round Table and  Sir Cumference and the Dragon of Pi.

5) Host a pie in the face or pie eating contest. Raise money for a local charity.

6) Give each student/child a digit of pi and a corresponding colored rectangle. Create a chain to hang with many digits of pi. How long was your chain? Compete across schools, classrooms, or classes.

7) Host a contest for the best decorated Pi symbol.

Get creative! How will you celebrate Pi day? Leave me a comment. I’d love to know what Pi day activities you will be doing!

Pi is approximately

3.1415926535897932384626433832795028841971693993751058209749445923

078164062862089986280348253421170679821480865132823066470938446095

505822317253594081284811174502841027019385211055596446229489549303

819644288109756659334461284756482337867831652712019091456485669234

603486104543266482133936072602491412737245870066063155881748815209

209628292540917153643678925903600113305305488204665213841469519415

116094330572703657595919530921861173819326117931051185480744623799

627495673518857527248912279381830119491298336733624406566430860213

949463952247371907021798609437027705392171762931767523846748184676

694051320005681271452635608277857713427577896091736371787214684409

012249534301465495853710507922796892589235420199561121290219608640

344181598136297747713099605187072113499999983729780499510597317328

160963185950244594553469083026425223082533446850352619311881710100

031378387528865875332083814206171776691473035982534904287554687311

595628638823537875937519577818577805321712268066130019278766111959

09216420198938095257201…

Need more digits? 100,000 digits of pi can be found at http://www.geom.uiuc.edu/~huberty/math5337/groupe/digits.html

Not enough? 1,000,000 digits of pi can be found at http://www.piday.org/million/

Still looking for additional inspiration? Check out our pinterest board Celebrate Pi Day.

Angela Culley

Angela Culley

Owner & Tutor at Math Ninja, LLC
As the founder of Math Ninja, Angela provides online and in person math tutoring for all ages including those studying for the GRE, GMAT, SAT, ACT, PPST, and other math specific subject assessments. Prior to launching her business, Angela coached K-12 educators on effective teaching strategies, curriculum writing, and assessment development.As a classroom teacher, she taught math to students ranging from grade 5 - 12. She has also taught both undergraduate and graduate math courses as an adjunct professor at the University of Virginia and Mountain State University.
Angela Culley
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