Percentage of homework that is left to be completed = 65% Then The percentage of homework that is already done = (100 - 65) percent = 35 percent = (35/100) = 7/20 = 0.35 So the amount of homework that has already been completed can be represented as 7/20 or o.35. Hope this is the answer you were looking for and i have helped you in this matter. Also i hope the procedure is easy enough for you to understand.
The denominator only changes if you're multiplying/dividing. You may need to create an <em>equivalent fraction</em> to add the fractions together, but you <em>don't</em> add or subtract the denominator.