It is 15 84/100 whose fractional part can be simplified. However, simplification could mean that you lose information about the precision.
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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.
0.714285 does not convert to a mixed fraction, just a fraction. It is: 142857/200000
You change the mixed number into an inproper fraction.