Simple and Opposite Events Review

Use Probability of One Event and Probability From Spinners first, then Probability of an Event Not Happening. Probability Maze and Simple and Opposite Events Review work well as a check at the end.

Use one spinner numbered 1 to 10 and one marble bag to find 12 event and opposite event probabilities. The directions on the page read: Spin once or pick one marble. Spinner parts are equal, and letters name the colors. Write each probability as a fraction in simplest form. An event and its opposite add to 1. The page opens with a worked example, and an answer key is included.

Yes, both. We made it for 6th Grade probability, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with simple probability. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

Subtract the probability of the event from 1. If P(hail) is 2/9, then P(not hail) is 1 minus 2/9, or 7/9.

The opposite of an event is that event not happening. An event and its opposite have probabilities that add to 1, such as P(A) = 1/7 and P(not A) = 6/7.

Count the equal parts that match the event and divide by the total number of parts. A spinner numbered 1 to 11 has 5 even parts, so P(even) is 5/11.

Yes. All 10 worksheets in this group have answer keys.