80/100 = 80%
80% is a value you might see on a phone battery, a sale sign, or a quiz score. It means most of something is there, but not all of it.
To picture 80%, imagine a row of 10 equal squares with 8 shaded. You can also think of it as a little less than a full amount, with about one-fifth left over.
A common mix-up is treating 80% as the same as 80 points out of any possible score. It represents 80 out of 100, so the total amount matters when you compare scores or quantities.
