• Welcome! Log in or Register Now for a free ProTeacher account!

what are you doing for pi day?



Senior Member

now I feel guilty because I wasn't planning on doing anything since 3.14 is on Saturday this year.:o This was a blast last year!

1. My students had to earn slices (slivers, really) of pie by passing off all their circle formulas at centers. As they finished they colored in a 15 degree "slice of pie." We had already listed the types of pies they would bring and decided on a color coding system, i.e. green for key lime, orange for pumpkin, etc. This also made it easier to serve the pie on PI day. They had to compute the area for the amount of pi they earned in order to get a plate and a fork. They loved it!! Plus, they really remembered the formula for end of year testing in May!:D

2. We made PI necklaces and held on the spot challenges to see who could repeat the most digits correctly.


Value Of Pi (π)
Count the number of letters in each word:

Pi (π) to 7 decimal places: (Word lengths are digits)
May I have a large container of coffee?

Pi (π) to 10 decimal places: (Word lengths are digits)
May I have a large container of coffee ready for today?

Pi (π) to 12 decimal places: (Word lengths are digits)
See, I have a rhyme assisting my feeble brain, its tasks oft-times resisting.

Pi (π) to 30 decimal places: (Word lengths are digits)
Now I, even I, would celebrate
In rhymes unapt, the great
Immortal Syracusan, rivaled nevermore,
Who in his wondrous lore,
Passed on before,
Left men his guidance
How to circles mensurate.

and another one also to 30 decimal places (written by Michael Shapiro)
Now I will a rhyme construct
By chosen words the young instruct.
Cunningly devised endeavor,
Con it and remember ever.
Widths of circle here you see.
Sketched out in strange obscurity.


3. We did the EdHelper units on Sir Cumference and the Knights of the Round Table and Sir Cumference and the Dragon of Pi. EdHelper is a subscription service, but there are tons of PI Day stuff online.

4. Students brought in cans and jar of varying sizes and measured them with string. See page 3 in this link: http://community.learnnc.org/dpi/math/archives/2005/06/grades_68_resou.php

5. Memorized Mnemonics for Circle Formulas.

Find the Area and Circumference of a Circle.

Tweedle-dee-dum and Tweedle-dee-dee,
Around the circle is pi times d,
But if the area is declared,
Think of the formula π "r" squared.

***Around the circle" is the circumference.
Circumference = π × d (diameter).
Area = π × r(radius) squared.

Area Of A Circle
Apple pie are square: A = π × r2
Apple pie are round: A = π × r × r

Circumference Of A Circle
Cherry pie delicious!: C = π × d

I'd love to hear what you are doing, as well.

log in to see attachments
    8.4 KB
Last edited:


Senior Member
My teaching partner does all the math, but we do a huge party for pi day every year.

1. She dresses up like a PIE.
2. We have about 20 room moms come in to volunteers, and the kids bring in pies
3. They graph pie preferences, and then they have to divide the pies into portions equal to the number of children that want that kind of pie (for example, if only 4 kids want a pie, they each get 1/4 of the pie, where the more popular pies, each kids gets about 1/32 of the pie)
4. then, while we eat, we read to them from pictures books: Sir Cumference and the Knights of the Round table, Sir Cumference and the Sword in the Stone, Sir Cumference and the Lady Di Ameter, etc...)

Fun day...love it!


Although, I don't celebrate Pi Day, there is a local middle school that always makes the paper for doing so. One thing they do is have a local pizzeria donate rounds pizzas for lunch.


Full Member
thank you so much!

Your ideas and links are absolutely wonderful. Thank you so much for your help! I really appreciate it.