What 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 julieverse.com.
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:
A visual explanation of Pi from Wikipdeia 
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”.
Experiment: Since I get the most from handson learning, this experiment from PBS.org goes hand in hand with the book.
Or you can use jar, lids, toilet paper rolls…anything circular for this experiment from exploratorium.edu, brings it all together.
Cutting π  
Materials circular object string scissors tape

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.
Crafts: For the little’s in your life, I like this Pi art project from momgineer.blogspot.com that shows the infinite possibilities of Pi.
Also from momgineer.blogspot.com these bracelet’s will work great for my 8 year old.
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.