79/100 = 79%
A value of 79% might show up as a test score, a phone battery level, or the share of people who choose a certain option in a survey. It tells you that something is true or complete for most of the whole, but not all of it.
To picture 79/100, imagine 100 small squares with 79 shaded in. It’s just under four-fifths, so you can estimate it as close to 80% at a glance.
One common mix-up is treating 79% as if it means 79 out of 10, or confusing it with 79 percentage points. The percent sign means the amount is measured out of 100, while percentage points describe the difference between two percentages.