March 14th, affectionately known as “Pi Day” (with 3/14 representing 3.14), is the biggest unofficial math holiday on the calendar. Here are some fun classroom activities to get your students engaged with the amazing constant!

**Memorizing the Digits of Pi**

One of the most popular competitive activities is memorizing the digits of pi. There are many mnemonics out there to remember the first several digits. For instance the phrase, “Can I find a trick recalling pi easily?” By taking the number of letters in each word of this phrase, you get the first eight digits of Pi. Up for a tougher challenge? Here is a video for remembering the first 100 digits! For the ultimate Pi Day competitor, this article from the Washington Post addresses how to memorize many thousands of digits.

**Making Pi themed Pies**

This great tradition involves making Pi themed Pies. (Please read in the voice of Bubba from *Forrest Gump*). There’s pizza pi, apple pi, Eskimo pi, Boston Crème pi, cherry pi, key lime pi, sweet potato pi, … Students can be judged on the creativity of their toppings and/or crusts.

**Creating a Pi Play-on-words**

Another idea is to have students develop a logo or art rendering of a pi play-on-words such as pi-rate, pi a la mode, American pi, pumpkin pi, sweetie pi, or chicken pot pi to name a few.

**Explore the Ratio of Circumference to Diameter**

For a more academic activity, a class can explore the ratio of circumference to diameter.

- Have your students bring in circular objects (e.g. Coffee can lid, frisbee, plates of different sizes, measuring cup, etc.)
- Use yarn to wrap around the circumference of a circular object (measure it with a ruler)
- Stretch yarn across the diameter of the object (measure it with a ruler)
- Find the ratio of the Circumference to the Diameter for each object
- Find the average of all of the results

Average =

How close to 3.14 did you get?

**More to Celebrate!**

Since Albert Einstein’s birthday and Stephen Hawking’s death day occurred on March 14th, a celebration of either man is also a great Pi Day tie-in!