Use interactive experiments such as "Heads or Tails" if you wish to investigate probability involving coins (see the link in the Resources section). This experiment gives you the ability to select up to a maximum of 10 coins to flip up to a maximum of 10,000,000 times, and it automatically counts the number of times "heads" lands faceup. The actual coin flipping occurs at random via a computer program, but the likelihood of either occurring is the same as on a real coin. Experiment with different numbers of flips and coins to determine when you get closest to equal results of "heads" and "tails," or determine the maximum number of flips that yield a wildly unequal result.
Spinners feature a pie-chart-like arrangement with numbers occupying different "slices" of the pie. Participants spin an arrow, and the number it points to is the result. As long as the size of the slices is equal, the odds remain the same for landing on any number. "Spinning Spinners" is an interactive experiment (see the link in the Resources section) that allows you to select a group of two spinners and spin them up to 1,000,000 times. The results are either added or subtracted from one another. Choose different groups of spinners, and attempt to determine the most likely cumulative score. Some spinners have unequal "slices" for the numbers.
A die is another popular device for illustrating probability. The experiment "Chase Me" (see the link in the Resources section) pits a tortoise and rabbit in a race with each other, and the animals move depending on the result of the cumulative score of two rolled dice. Set the results that cause both the tortoise and the rabbit to move, and experiment with the probability of different scores appearing when you roll two dice. Keep in mind that seven is the most common result of rolling two dice: One and six, two and five and three and four all combine to give seven.
Illustrate probability using a variety of objects. One interactive probability experiment, "What's in Santa's Sack," (see the link in the Resources section) features Santa's sack and a set number of presents. The experiment aims to determine how many times Santa must pull one random present from his sack and replace it for you to be certain of the present's contents. Choose a sack depending on the number of objects inside it, and choose a number of times Santa pulls an item out, then calculate the minimum number of pulls to ensure what is in the sack.