2) Have them roll it around 4-5 fingers. The roll should measure more than 7 inches, otherwise re-wrap it larger. Then tighten it down to a little more than 6.25 inches (estimate 6.28").
3) How big is the radius of this rolled measuring tape?
4) Take predictions.
5) Measure from the outside toward the center of the roll.
6) Have students write reflections about how many radii fit around the circumference. Will this amount change for different sized circles?
Let me know how it goes in the comments!