86.75 = 86 and 75/100 = 86 and 3/4
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Well, honey, to change 86.75 to a fraction, you need to consider the decimal point. 86.75 is the same as 86 and 75 hundredths. So, you can write it as 8675/100 to get it in fraction form. Reduce it down if you want, but that's the basic idea.
To get a fraction of another fraction you have to multiply the fractions. To multiply fractions, just use this simple algorithm: Step 1-Turn all whole numbers and mixed numbers into improper fractions. Step 2-Multiply the numerators of the 2 fractions. The answer to that problem will be the numerator of the answer. Step 3-Multiply the denominators of the 2 fractions. The answer to that problem will be the denominator of the answer. Step 4-Reduce.
98 is an integer and there is no sensible way of representing it as a mixed fraction.
A mixed number
It is a fraction - which may be mixed or proper.