Which is bigger three fifths or five eighths?

3/5 or 5/8

Bring both to the same denomiator of 5 x 8 = 40

Then bring the numertors to their equivalent over '40'

3/5 & 5/8 = > 24/40 & 25/40

Compare the numerators(top numbers).

Clearly 25 > 24

Hence it follows that 25/40 > 24/40 => 5/8 > 3/5