How to Add or Subtract Percentages

1. Convert the percentage you want to add or subtract to a decimal. For example, 60 percent in decimal form is equal to .60.
2. Multiply the amount to add or subtract to by the decimal percentage.
3. Add or subtract the result from the previous step from the original amount. If you want to find 60 percent off an item that is normally $10, multiply $10 by .60. The result is $6; subtract that from the original amount and you know the sale price is $4. Alternatively, if you wanted to add 60 percent, the new price would be $16.