I started celebrating pi day at my first school, where it was actually a collaborative effort with a veteran English teacher. He had developed the method with some colleagues, but I wrote the worksheet to emphasize student thinking rather than providing all the steps and creating a mindless plug and chug activity.
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I think I have a lot more fun watching kids roll circular objects down the hall than they do crawling or crouching for 100 feet, but it gets them moving and maybe experiencing circumference helps them understand it? I also enjoy writing silly messages on the start, half way and finish lines (blue painters tape- easy to see and remove). One issue that comes up in every class is units. We have tiles that are 1 foot long so it was easiest for me to make the track 100 feet. In class I allow students to use cm or inches at their whim, so long as they are consistent with themselves throughout the activity, so many students measured diameter in cm. You can guess how well their value of pi came out!
While they were calculating and eating I played my favorite pi music.