87 is an integer and so there is no sensible way of writing it as a fraction or mixed number.
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87% = 87⁄100
87/100 and 0.87
0.0087 as a fraction = 87/10000
That is 29/62
87.5 as a mixed number is 87 5/10 or 87 1/2 in simplest form. As an improper fraction it is 1875/10.