The fraction 12/21 is equal to 57.14% when converted to a percentage. This means that if you had 21 items and took 12 of them, you'd have about 57% of the total. It's a bit more than half, but not quite as much as three-fifths.
In everyday life, you might see this fraction pop up in various situations. For example, if 12 out of 21 students in a class passed a test, you could say that 57.14% of the class succeeded. Or if you completed 12 tasks out of a list of 21, you'd be 57.14% done with your work. It's a handy number to know, especially when dealing with parts of a whole or comparing ratios.
