72/80 = 90%
A value like 72/80, or 90%, can show up in everyday life when you complete 72 out of 80 tasks, answer 72 out of 80 questions correctly, or attend 72 of 80 school days. It tells you that most of the total has been completed, earned, or achieved.
You can picture 90% as 9 out of every 10 parts, with only 1 part missing. A quick estimate is to notice that 72 is close to 80, so the fraction must be close to 100% but not quite perfect.
A common mistake is to treat 90% as the same as 90 percentage points, even though the meaning depends on what is being measured. It is also easy to forget that 90% still leaves 10% unfinished or incorrect.
