It represents the order of the root that needs to be calculated.
A denominator of 2 means a square root.
A denominator of 3 means a cube root.
And so on.
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How do you use an exponent to represent a number such as 16
smaller
It represents the ratio between the numerator and the denominator. It is totally misleading to suggest that it represent anything like "parts of a whole". The ratio of the surface area of a sphere to its volume is 3/r. In this expression 3 parts out of the "total" radius is not a particularly meaningful or useful concept.
19
Multiply the whole number part by the denominator of the fractional part and add the result to the numerator of the fractional part.