(I am not sure if this is what you are looking for)
7/8 is seven eights, so we can break it into 7 parts.
[tex]\frac{1}{8} + \frac{1}{8} + \frac{1}{8} + \frac{1}{8} + \frac{1}{8} + \frac{1}{8} + \frac{1}{8} = \frac{7}{8}[/tex]
Hope this helps, have a nice day!