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.
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.
Five eighths is not equal to five sixteenths. Five eighths is a larger fraction than five sixteenths.
The percentage of five eighths is 62.5%.
One quarter is two eighths, so five eighths subtract two eighths is three eighths.
Two and five eighths
The answer is 1 1/4.
There 45 eighths in 5 and 5 eighths.
five eighths = 5/8 = 0.625 = 62.5% Hence five eighths < (less than) 65%
[Five sevenths] is 0.0893 greater than [five eighths]. (rounded)
Thirty eighths. Or three and six eighths.
three eighths
333
The answer is 2 and three eighths