12/78 as a percentage is 15.38%. This fraction simplifies to a small part of a whole, and when expressed as a percent it shows just over fifteen percent.
The fraction 12/78 can also be reduced to 2/13, which helps see how it relates to other common fractions. As a percentage, 15.38% tells you that the numerator is a little more than one‑tenth of the denominator.
In everyday terms, if you had 78 items and took 12 of them, you would have taken about fifteen out of every hundred items. This makes it easy to compare the fraction to other percentages you might encounter.