You cannot use an LCD with just one number since the C in LCD stands for COMMON and you need more than one number before there is a possibility of anything being in common.
0.21428571 = 21428571/100000000 which cannot be simplified (and no LCD used in deriving that).
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subtract? Find a common denominator (LCD is preferred). Convert each fraction to an equivalent fraction with the LCD. Add numerators, keep LCD as new denominator. Reduce the fraction.
For the first fraction, divide the give denominator into the LCD, take that result and multiply by the given numerator to create a new numerator for the LCD. Repeat for each fraction.
It is 12
288
the LCD of fractions is the least common multiple. So we are looking for the least common multiple of 16 and 20 which is 20. So the Least common denominator is 80