National-Pi-DayWhat a perfect time in our life to go over “What is Pi Day” with our girls. This week, our 8 year old’s math homework has been about area, perimeter, circumference, etc, etc., etc. and I’m sure her teacher has a plan today to incorporate Pi Day at school.

I searched through some blogs and Pinterest (of course) for some kid (and adult) friendly Pi day activities and explanations. So here are my favorites:

First, an explanation from

Pi is the ratio of a circle’s circumference with its diameter or the distance around the outside of the circle is the same distance as going from one side of the circle to the other side (making sure to go through the center) “three plus a little bit more” times. The actual number is a never ending decimal  that is most often rounded to 3.14. Pi Day is known throughout the mathematical community as March (third month) 14.

Then a great visual explanation of Pi from Wikipedia:

For our reading time, I called my favorite book store Once upon a Storybook and found the perfect book for the day  “Sir Cumference and the Dragon of Pi”.

Sir Cumference and the Dragon of Pi

Experiment: Since I get the most from hands-on learning, this experiment from goes hand in hand with the book.

Image from
Image from

Or you can use jar, lids, toilet paper rolls…anything circular for this experiment from, brings it all together.

Cutting π
circular object

  • To Do and Notice
    Carefully wrap string around the circumference of your circular object. Cut the string when it is exactly the same length as the circumference. Now take your “string circumference” and stretch it across the diameter of your circular object. Cut as many “string diameters” from your “string circumference” as you can. How many diameters could you cut? Compare your data with that of others. What do you notice?
  • What’s Going On?
    This is a hands-on way to divide a circle’s circumference by its diameter. No matter what circle you use, you’ll be able to cut 3 complete diameters and have a small bit of string left over. Estimate what fraction of the diameter this small piece could be (about 1/7). You have “cut pi,” about 3 and 1/7 pieces of string, by determining how many diameters can be cut from the circumference. Tape the 3 + pieces of string onto paper and explain their significance.

If you are in the San Francisco area, Exploratorium has an excellent FREE Pi Day Event  taking place on Pier 15, Saturday, March 14, 2015 • 10:00 a.m.–5:00 p.m.

Image from
Image from

Crafts: For the little’s in your life, I like this Pi art project from that shows the infinite possibilities of Pi.

Image from:
Image from:

Also from these bracelet’s will work great for my 8 year old.

Pi braclet
Image from


And of course, it comes down to food! Here are some Pi food deals:

  • All Blaze Pizza locations celebrate $3.14 Pizza Pi’s

  • Prego Ristorante in Irvine is offering Pizza Pi’s for $3.14

  • For more food deals, check out this article from LATimes featuring Pi deals from San Diego to Boston. 


Leave a Reply

Your email address will not be published. Required fields are marked *