21/33 as a percentage is 63.64%. This is the rounded value you’ll see most often when the fraction is turned into a percent.
The fraction 21/33 can be reduced by dividing both the numerator and the denominator by 3, giving 7/11. Even though it’s a simpler fraction, the percentage stays the same because the value hasn’t changed.
Knowing the percent form is handy for quick comparisons. For example, if a test score is 21 out of 33 points, you can say the score is about 63.64 % correct, which is easy to understand at a glance.
