T is 7.5yrs right now and he actually has not had any experience with π in the past. We started out the day with basically the same description that I just gave of what pi day is. I got a few looks from him, he may be starting to figure out that his parents are math and science geeks.
Then I busted out the girl scout cookies for our first lesson in π!We measured the diameter of a girl scout thin mint cookie and multiplied it by π to determine the circumference of the cookie. Go ahead and check out the picture below, I know you have always been curious! (remember you can click on all of my pictures to make them larger)
T wanted to try his hand at drawing the symbol for π.
The fun continued by measuring the diameter and radius of a paper plate and then calculating the circumference. Sorry, this picture is a little hard to see, we used colored pencils, markers would have worked better.
He measured each of their diameters and then he calculated their circumference using a calculator. I think when T is a bit older (maybe next year) I will have him do the math without the calculator. We have not gotten much into decimals yet except for comparing them to fractions.
We ended our little celebration with a book from one of our favorite series Sir Cumference and the Dragon of Pi.