As we continue to explore circles, we also do a classroom project where we collect circular items and use them to find the diameter, radius, and circumference. One thing that I note though, is that it is helpful to measure them ahead of time, since they are often not an exact measurement. Depending on how much measuring, estimating, and multiplication with decimals you want to do, dictates the objects you may want to select ahead of time.
The students trace each object onto a piece of paper and label it (blue lid, wipes dispenser, etc). It helps to have a running chart posted in the room that can be filled in to check answers against. They then use a ruler to measure the diameter of the circle, divide by 2 to find the radius, and multiply by Pi to find the circumference. This project can be extended as kids can use different units to measure with.
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