66/100 = 66%
A value of 66% might show up as a test score, a poll result, or the amount of a project that’s finished. It tells you that a little over half of the whole is included.
To picture it quickly, imagine 100 small squares with 66 shaded in. You can also think of it as roughly two out of every three parts.
One common mix-up is treating 66% as exactly two thirds. Two thirds is a little more than 66%, so the difference matters when you need an exact value.