Simple Probability

Simple Probability: Learn

Probability =
total ways a specific outcome will happen
total number of possible outcomes

Example: There are 87 marbles in a bag and 68 of them are green. If one marble is chosen, what is the probability that it will be green?

Probability =
specific: green (68)
total: all (87)
= 68 ÷ 87 = 0.781609...

Watch the instructions carefully to determine how many decimals places to round, or if the number should be converted to a percent. In the example above, if we round to two decimal places, we get 0.78.

Simple Probability: Practice

Find the probability to the nearest hundredth.


Desired outcomes = ; Possible outcomes =

Press the Start Button To Begin

You have 0 correct and 0 incorrect.

This is 0 percent correct.


Game Name Description Best Score
How many correct answers can you get in 60 seconds? 0
Extra time is awarded for each correct answer.
Play longer by getting more correct.
How fast can you get 20 more correct answers than wrong answers? 999