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# Add or Subtract a Percentage

## How to add a percentage to a number - Step by Step

To add a percentage (%) to a number, i.e., If you want to add a y percent to an x amount, you can use the following formula:

End Value = x + (( y / 100) * x )

Where: x represents the start or inicial value and y the percent we want to add. See the example below:

### How to increase or add 10% to 100?

Plugging the values in the formula above:

End Value = 100 + (( 10 / 100 ) x 100)

End Value = 100 + (( 0.1 ) x 100 )

End Value = 100 + ( 10 )

## How to subtract a percentage from a number - Step by Step

To subtract a percentage (%) from a number, i.e., If you want to subtract a y percent to an x amount, you can use the following formula:

End Value = x - (( y / 100) * x )

Where: x represents the start or inicial value and y the percent we want to subtract. See the example below:

### How to decreasee or subtract 10% to 100?

Plugging the values in the formula above:

End Value = 100 - (( 10 / 100 ) x 100 )

End Value = 100 - (( 0.1 ) x 100 )

End Value = 100 - ( 10 )