It"s very common once learning about fractions to want to understand how convert a portion like 21/40 into a percentage. In this step-by-step guide, we"ll present you how to rotate any portion into a percentage really easily. Let"s take a look!


Want to quickly learn or show students exactly how to convert 21/40 come a percentage? beat this really quick and fun video now!


Before we obtain started in the fraction to portion conversion, let"s walk over some really quick fraction basics. Remember that a numerator is the number above the fraction line, and the denominator is the number listed below the fraction line. We"ll use this later on in the tutorial.

You are watching: 21 40 as a percent

When we are using percentages, what we space really saying is that the portion is a portion of 100. "Percent" way per hundred, and also so 50% is the same as saying 50/100 or 5/10 in fraction form.

So, due to the fact that our denominator in 21/40 is 40, us could change the fraction to do the denominator 100. To do that, we divide 100 by the denominator:

100 ÷ 40 = 2.5

Once we have actually that, we can multiple both the numerator and denominator through this multiple:


21 x 2.5/40 x 2.5=52.5/100

Now we have the right to see the our fraction is 52.5/100, which means that 21/40 as a percentage is 52.5%.

We can additionally work this out in a simpler method by first converting the fraction 21/40 come a decimal. To do that, we simply divide the numerator by the denominator:

21/40 = 0.525

Once we have actually the answer to that division, we deserve to multiply the prize by 100 to make it a percentage:

0.525 x 100 = 52.5%

And over there you have it! Two different ways to convert 21/40 come a percentage. Both room pretty straightforward and easy come do, however I personally choose the transform to decimal method as the takes less steps.

I"ve seen a most students get puzzled whenever a inquiry comes up around converting a portion to a percentage, yet if you monitor the procedures laid out below it need to be simple. The said, you may still need a calculator for more complicated fractions (and girlfriend can always use our calculator in the kind below).

See more: The Operation Can’T Be Completed Because An Unexpected Error Occurred (Error Code -50).

If you want to practice, grab yourself a pen, a pad, and a calculator and try to convert a couple of fractions to a percent yourself.

Hopefully this tutorial has actually helped you come understand exactly how to transform a portion to a percentage. You deserve to now walk forth and also convert fractions to percentages as lot as your little heart desires!

Fraction to percent Calculator


Fraction together Percentage

Enter a numerator and also denominator