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What Does Percent Chance Mean?: Activity 2 of 3

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Another way to talk about probability is by using percents. Percent means "out of 100." Instead of describing a probability as 1 out of 4, we say 25%.  Think of it this way: 25 out of 100 is one quarter of 100, just as 1 is one quarter of 4.

Here's how to do the math:

  1. "1 out of 4" = 1/4
  2. Divide the top number by the bottom number 1 ÷ 4 = 0.25
  3. Then, move the decimal 2 places to the right and add the percent sign.

0.25 = 25%

So, let's go back to that coin toss.

A coin has a 1 out of 2 chance of landing heads up. What is the percent chance that it will land heads up?

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