4/66 as a percentage is 6.06%. This value tells you how big the part is compared to a whole, using the familiar percent format.
The fraction 4/66 can be reduced to 2/33, which still represents the same size of a piece. It’s a tiny slice of any total, showing that only a small amount is being considered.
In everyday situations, 6.06% might describe a small discount, a tiny portion of a budget, or the fraction of a class that scored a particular grade. Knowing the percent makes it easy to compare with other numbers that are also expressed as percentages.