Students can discover pi on their own with this hands-on activity. Gather several round or circular objects (i.e. lids, containers). Students then measure the circumference and diameter of each object and record their measurements on the activity sheet (the smaller the units the better - I have students use mm). They then divide and record their quotient (maybe to the nearest thousandth). At the conclusion of the period, have a class discussion and discuss measurements for the last column. Ask students what they notice about the numbers (they should all be around 3 if they measured and divided correctly. I usually talk about why each value is not exactly 3.14 and show a quick video on pi.
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