# How much is 90 percent of twenty one

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We think you reached us looking for answers like: What is 90 (90%) percent (%) of twenty one (21)? Or may be: How much is 90 percent of twenty one. See the solutions to these problems below.

## How to work out percentages - Step by Step

Here are the solutions to the questions stated above:

### 1) What is 90% of 21?

Always use this formula to find a percentage:

% / 100 = Part / Whole replace the given values:

90 / 100 = Part / 21

Cross multiply:

90 x 21 = 100 x Part, or

1890 = 100 x Part

Now, divide by 100 and get the answer:

Part = 1890 / 100 = 18.9

### 2) 90 is what percent of 21?

Use again the same percentage formula:

% / 100 = Part / Whole replace the given values:

% / 100 = 90 / 21

Cross multiply:

% x 21 = 90 x 100

Divide by 21 and get the percentage:

% = 90 x 100 / 21 = 428.57142857143%