# What percent of 42 is 21?

Answer: 50 percent of 42 is 21

## Fastest method for calculating what percent of 42 is 21

Assume the unknown value is 'Y', and 21 of 42 can be written as:

Y = 21 / 42

By multiplying both numerator and denominator by 100 we will get:

Y = 21 / 42 x 100 / 100 = 50 / 100

Y = 50%

Answer: 50 percent of 42 is 21

If you want to use a calculator, simply enter 21÷42x100 and you will get your answer which is 50

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## Have time and want to learn the details?

Let's solve the equation for Y by first rewriting it as: 100% / 42 = Y% / 21

Drop the percentage marks to simplify your calculations: 100 / 42 = Y / 21

Multiply both sides by 21 to isolate Y on the right side of the equation: 21 ( 100 / 42 ) = Y

Computing the left side, we get: 50 = Y

This leaves us with our final answer: 50 percent of 42 is 21