Two ways: Take the percent of the number and subtract it from the number or multiply the number by 100 minus the percent.
Example: 25 percent off 24 dollars.
24 x 0.25 = 6
24 - 6 = 18
or
24 x 0.75 = 18
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divide by 4, then multiply your new number by three
You take the original value times 0.25. That number is 25% of the original, so you take the original number minus that number.
The quickest way is to multiply the original number by 0.9
work out 10% and then half it, add the two together and take it away from the first number
5 percent i got it off of the worlds best math book so trust me