Confirm that you're working with integers. To make sure a number given to you in a test or homework problem is an integer, express the number in decimal form. Use a calculator or division to convert fractions to decimals. If there is no remainder, as in the conversion of 8/4 to 2.0, you indeed have an integer to work with. But 9/5, or 1.8 in decimal form, is not an integer.
Multiply the number by 100. As a percentage, the integer number one is converted to 100 percent. The integer -15 is accurately expressed at -1,500 percent. Percentages can be positive or negative to depict rates of change, which can occur in different directions.
Express the number as a percentage. If you simply multiply an integer by 100, you are left with an integer 100 times larger than the initial one. Always put a percent sign after a number that represents a percentage or percent conversion. For example, -4 is accurately expressed as "-400%," but may be incorrectly written as -400, 400%, -4.00, -4.00% or 4.00%. Remember that negatives don't change, but decimals are removed and percent signs are crucial.
Check your work. Converting integers to percentages is simple, so you want to eliminate any potential mistakes. Once you have an answer ready and properly expressed in percent form, divide it by 100 and remove the sign. You should be left with the original integer.