To decrease a number means to take away, or subtract, something from the number.
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You can decrease a number by 10 percent by multiplying it by 0.9
Multiply the original number by 0.95
n/10
You can put the percent number over 100 and multiply it by the number you want to decrease, like 9% decrease from 100 would be 9/100 times 100... If you have a calculator, you can move the decimal place over to the right twice, and mulitply. So 9% would be 0.09.
It is 75%.