How many groups of Two-thirds are in Three-fifths? A fraction bar labeled 1. Under the 1 are 5 boxes labeled one-fifth. Under the 5 boxes are 3 boxes containing one-third. Under the 3 boxes are 15 boxes labeled StartFraction 1 Over 15 EndFraction. StartFraction 9 Over 15 EndFraction StartFraction 9 Over 10 EndFraction 1 and one-third 1 and StartFraction 1 over 9 EndFraction