That probably would depend on what you mean by "opposite."
You might mean additive inverse. (http://en.wikipedia.org/wiki/Additive_inverse), or you might mean multiplicative inverse (http://en.wikipedia.org/wiki/Multiplicative_inverse), or who knows, there's probably an infinitude of different ways you could define the opposite of five eighths.
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The answer is 1 1/4.
Thirty eighths. Or three and six eighths.
three eighths
No, three fourths is the same as six eighths which is larger than five eighths
Answer One half is the same as four eighths, so five eighths is one eighth more.