12/66 as a percentage is 18.18%. This value tells you that the fraction represents just under one‑fifth of a whole.
If you simplify the fraction, 12/66 reduces to 2/11. Both 12/66 and 2/11 give the same percentage, so you can use either form depending on what looks clearer in your work.
Knowing that 12/66 equals 18.18% can help when you compare parts of a group, such as measuring how many students passed a test or what portion of a budget is spent on supplies. It’s a quick way to see the size of a piece relative to the whole.
