Answer/Step-by-step explanation:
Change 75% to .75 and multiply .75 times your number.
This can be done by pencil and paper (watch out for the decimal) or by calculator.
If you are trying to do this in your head (mental math) then its good to know that 75% is the same as 3/4. Divide your number into 4 pieces. Half and the half again works for this. Or just divide by 4. Then gather up 3 pieces and throw away the fourth piece. Now you have 3/4 of your number. This is the same as 75% of a number.