Which Spinners? is an activity from NRICH that is available to download from the National STEM Centre eLibrary.
A flash simulation makes it possible to create the throwing of one, two (or more) spinners of various sizes. The relative frequency of the sum of the spinners (and the difference in the case of two spinners) can be explored by throwing the spinners as many times as desired. The problem statement challenges the student to try to predict what the relative frequency chart will look like when it settles down.
A second task challenges the student to identify the spinners for some given relative frequency diagrams.