## What is a Percentage?

**Percentages**

A percentage is a ratio expressed in a particular way; It is to compare one quantity to 100.

Calculate a percentage:

To simply express a percentage, just clearly place the problem in a table of proportionality to four numbers, which is 100.

For example:

On 835 visitors of a castle in a day, 144 are foreigners; What is one

percentage p you are looking for.

Number of foreigners 144 p

Total visitors 835 100

Apply a percentage

Apply a percentage p % at an amount, it’s multiply this amount by p and divide

by 100.

Decimal expression of a percentage:

A percentage is therefore primarily a special writing a number which can be

expressed in another way; in particular, we can give a simple decimal entry,

or even a fractional writing.

For example, 50% = 0.5. So to calculate 50% of a quantity, you can multiply that by

0.5.

But 50% = 1/2 (half, half). We can so all as well divide the amount by 2.

Increase, decrease

Increase a number by a percentage calculator, this is add this percentage to 100%

initial. Therefore calculate a percentage greater than 100% of the original amount.

For example add 10%, is calculated (100 + 10), i.e. 110% of the original amount.

To the contrary, to withdraw 10%, it is calculating (100-10), 90% of the original amount.