Enter the number
Press the percent key if your calculator has one
For “x percent of y,” multiply y by x and divide by 100
For “what percent is a of b,” divide a by b and multiply by 100
For adding a percentage, multiply the original number by 1 plus the percent as a decimal
For subtracting a percentage, multiply the original number by 1 minus the percent as a decimal
Use parentheses if needed to keep the order correct
Check the calculator display before pressing equals