March 13th, 2008

10:38 PM ET

Friday is 3.14.2008. And that means it's Pi Day.

No, really. Every year, people actually celebrate that little number with lots of decimal places on this day. You can read all about it here. And teachers, there are some ideas for Pi Day classroom activities. If you try any out, let us know how you did. Take a pic, and send in an iReport.

Enjoy the pi.

**Gerald Smith, CNNSN Producer**

AliceWe don't have Pi Day here. I never knew about Pi Day! It's so fun! ðŸ˜€

LannaEver since this day started, most of the kids in my school have benn saying "Happy Pi Day" i think it's kinda funny really, and I guess the math teachers like it aswell

HelenI can't believe that the U.S . is in the mess we are in. We are suppose to be a very strong nation. I think if we stop being so nice to every nation that wants help from us, and take care of our own, this country would be a better place for all.

RhemaI never knew that there was a pi day.I t sounds like it could be fun

EmilyPi day? So Techie/Nerdy/Dorky. lol...

IndridI can't believe I missed out on Pi day! Damn!

BertDig this: I memorized it!

3.14159265358979323846264338327950288419716939937510582097494459230781640628620899!!!!!!!!!!!!!!!!!!!!!!!!!!

There is one guy who memorized 83000 digits!

Does he have a life?

AutumnMy teacher took it a little to far by how he did a paper chain, gave away pie, and had us(eighth graders) sing a cheesy pi day song and recorded it.

thatcavalierfan94have a happy pi day! this is kinda cool.... i love pie the kind that you eat, like with a fruit filling and a crust, but i didn't know there was a pi day for the mathematical term 3.14! wow, you learn something new every day!

Kinghow could u memorize dat! i cant even memorize my cell fone #! and datz only 10 digits

-Rico from HOTLANTA

BobI LIKE PI!!!!!

RobPi stinks, I like fractals, quadratics, and matrices.

MegI never knew there was such a thing as pi day? How cool!

sandroPI Z DAY-–HAPPY PI Z DAY–OK-