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Let's say your fraction is 15 over 25.

15 x

__ = __

25 100

You must cross multiply 15 and 100 then x and 25. Then you would get 25x = 1500. But you need to get rid of 25. So you need to divide 25 x by 25 and because you did that you have to divide 1500 by 25. So you get x = 60. Or if you denominator goes in to 100, you can multiply across. So 100 divided by 100 is 4. So 25 multiplied by 4 = 100. Then you have to multiply you numerators. So 15 x 4 = 60. Either way, your final answer is 60%.

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