3 Pi Day activities (and 10 Pi Day Facts)

Looking for a fun math activity to celebrate Pi Day? In this post I share three Pi Day math activities and 10 fun Pi Day facts to share with students.

It's almost Pi Day! Here are a few Fun Facts about pi and Pi Day that would be fun to share with students on this great Math holiday:

1: It took 1,000 years to prove pi irrational.

2: The first people to refer to the ratio between the diameter and circumference of a circle were the Ancient Egyptians.

3: "I prefer pi" is a palindrome.

4: Albert Einstein was born on Pi Day, 1879.

5: 22/7 is sometimes used to estimate pi.

6: The first major Pi Day celebration was in 1988.

7: Pi has been calculated past the two quadrillionth digit. 

8: P and pi are both the 16th letters in their alphabets.

9: You can likely find your phone number in pi. Here's the site that searches for it: http://angio.net/pi/. I found mine!

10: And the one that completely blows my mind: 3.14 backwards is PIE!

Pi Day pennant

To celebrate Pi Day, I created three fun activities that let kids get artsy while not losing a day of learning. That one above is a Pi Day Pennant for middle and high school students with area and circumference problems and fun pi facts on each pennant. 

Pi Day pennant -- metric version

Some of the circle problems ask students to combine their understanding of the two circle formulas by finding area given circumference, for example. A fun challenge! There is also this metric version.

Pi day pennant for younger students

And here is a Pi Day pennant for middle school with less challenging circle problems any yummy fun-to-color pies. 

When the pennants are solved and colored, they can be hung along a string in your classroom to celebrate!

Pi Day mobiles hanging in a classroom

My friend Julia from Teacher Julia's Resources sent me this great photos of her students' Pi Day mobiles hanging from their classroom ceiling. Here's another photo from her classroom:

Pi Day activities

I bundled all 3 of the activities in this post (plus the metric version of the Pi Day pennant) in this discounted Pi Day Activities Bundle.

Pi Day Activities Bundle

Happy Pi Day!


  1. The pi day activity #10 isn't "backwards" its a reflection about a veetical line. An even better math activity.

  2. I just wish Pi Day didn't land on spring break every year.

    1. Around here we get a February break and an April break...March is a long haul! Happy vacation Pi Day! :)