# What percent of 21 is 9?

Answer: 42.857 percent of 21 is 9

## Fastest method for calculating what percent of 21 is 9

Assume the unknown value is 'Y', and 9 of 21 can be written as:

Y = 9 / 21

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

Y = 9 / 21 x 100 / 100 = 42.857 / 100

Y = 42.857%

Answer: 42.857 percent of 21 is 9

If you want to use a calculator, simply enter 9÷21x100 and you will get your answer which is 42.857

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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% / 21 = Y% / 9

Drop the percentage marks to simplify your calculations: 100 / 21 = Y / 9

Multiply both sides by 9 to isolate Y on the right side of the equation: 9 ( 100 / 21 ) = Y

Computing the left side, we get: 42.857 = Y

This leaves us with our final answer: 42.857 percent of 21 is 9