Image courtesy of
Image courtesy of

Happy Pi Day! I just found out that the celebration of Pi Day was actually started 28 years ago at Exploratorium museum in San Francisco. The day celebrates the never-ending number 3.14159 and Einstein’s birthday.

Exploratoium shares the celebration by offering FREE admission to the museum with π-themed activities, rituals, antics, and plenty of pie. For a schedule of events click here.

I shared this information last year and think it’s great a way of explaining to the day to kids – so I’m sharing it again! Be sure to look at the bottom of this post for some Pi Day Deals.

 I love this explanation of Pi Day 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.

Here’s 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.

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

  • You can save $3.14 on a large pie from Whole Foods bakery or take $2 off any large “take and bake” pizza. This deal is good for a limited time and excludes frozen pizzas.
  • For more great Pi deals visit  you’ll find details on deals at places Chuck E. Cheese, Papa John’s, Marie Callender’s and more. 

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