Working as a team, students discover that the value of pi (3.1415926...) is a constant and applies to all different sized circles. The team builds a basic robot and programs it to travel in a circular motion. A marker attached to the robot chassis draws a circle on the ground as the robot travels the programmed circular path. Students measure the circle's circumference and diameter and calculate pi by dividing the circumference by the diameter. They discover the pi and circumference relationship; the circumference of a circle divided by the diameter is the value of pi.

This unit focuses on measurement and data for second-grade. The second-graders learn how to accurately measure natural objects using nonstandard units (unifix cubes) and standard units (inches). During field experiences, the students learned how to use field guides and how to collect data for a BioBlitz. Students used their data to create bar graphs, picture graphs, and analyzed their data.