Assuming that sisths is your fail at spelling sixths, it is any fraction of the form (5*k)/(6*k) where k is a non-zero integer.
The equivalent fraction for five tenths is one half.
535/1000
the fraction for 5/8ths is .63
a equivalent fraction is 10/25
10/12
10/16
10/16
It is 5000/10.
10/16
25/30
10/12
10/28