12/28 as a percentage is 42.86%. This is the rounded value you get when you express the fraction in a percent form.
The fraction 12/28 can be reduced to 3/7, which shows the same relationship in a simpler way. Both forms represent the same part of a whole.
Seeing the number as a percent makes it easier to compare with other percentages, like a test score of 45% or a discount of 40%. It tells you that the fraction is a little less than half.
Remember, 42.86% tells you exactly how much of a whole 12 out of 28 is, in a format most people use every day.
