Five students passed out of twenty. The jar has 3 cups left from a 12-cup batch. You are not looking for 15% of a price—you want what percent the part is of the whole. Enter part and total; the answer is the rate for a grade line, a chart label, or a quick sanity check on a ratio.
Multiplying a percent against a number is the other direction on the percent-of-a-number page. Comparing last year to this year is percent change. This form is the "part over total" habit only.
5 as a percent of 20 lands at 25% with the defaults—easy to misread as "20% of 5" if you rush.
When the total is not obvious
Make sure the total actually includes the part. Scores out of 100 are clean. "Passed out of enrolled" needs the enrolled count, not just the pass count twice. Double-check before you paste into a slide.
Need dollars from a rate? 25% of 80. Need how much a value moved? change from 80 to 100. Long decimals before you turn them into a clean percent? round 18.756 to two places on its own page.
- Part should not be larger than total unless you are modeling something odd on purpose.
- Copy part and total beside the percent in shared notes.
- One ratio per run.
Ordinary fraction-to-percent math for classwork and dashboards, not statistical significance testing.