Pizza pi

Completing this measuring activity will help your child to understand the relationship between a circle's diameter and circumference. Children will recognize that the distance around is a little more than three times the distance across a circle.

With older or more mathematically curious children, you may wish to introduce the number pi (3.14...) as the amount that the circumference is greater than the diameter. A great time to introduce the number pi is on "Pi Day," which is (when else?) on the fourteenth of March (3/14).