This activity simulates the radioactive decay process by rolling 100 "dice" (that represent unstable nuclei) and seeing how many of them have decayed (which is represented by rolling a "one"). You can then roll the remaining dice to see how many of the remaining unstable nuclei remain, etc. The odds of decay can be changed by setting the number of sides of the "dice".
The "dice" that have decayed are represented by turning red. All of the non-decayed "dice" are not filled in.
Number of sides: 2