For example, a quarter (25 cents) is 25 percent of a dollar (100 cents).
The 25 above is the numerator of a fraction whose denominator is 100. So, the fraction 25/100 is 25 percent, sometimes written as 25%.
Probabilities are often expressed in percents.
Click here to see how to convert between fractions, decimals and percents.
Now, here's a problem for you:
I gave half my marbles to Vic and half of what remained to Nancy.
What percent of my marbles do I still have? _____%