### What is percentage?

In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%", or the abbreviations "pct.", "pct", sometimes the "pc" is also used. For example, 25% is equivalent to the decimal 0.25, or the fraction ^{25}/_{100}.

### Basic formula for calculating percentages

Although the percentage formula can be written in different forms, it is essentially an algebraic equation involving three values.

P% × V1 = V2

P% is the percentage, V1 is the first value that the percentage will modify, and V2 is the result of the percentage operating on V1. The converter/caculator provided automatically converts the input percentage into a decimal to compute the solution.

## [#1]

### What is 5% of 100?

**ANSWER: 5.** Calculation:5/100 x 100 = 5 (or) 0.05 x 100 = 5

## [#2]

### 5 is what percent of 10?

**ANSWER: 50%.** Calculation: 5 x 100 / 10 = 50.00% (or) 500 / 10 = 50.00%

## [#3]

### Percent change from 5 to 20?

**ANSWER: 300%.** Calculation: 20 - 5 /5 x 100 = 300%

## [#4]

### 5 is 25% of what number?

**ANSWER: 25%. ** Calculation: 5/25% = 20