2 answers
(click or scroll down)
first is: 1/5
next is:1/3
lastly is:4/6
1/3
4/6
1/5
next is:1/3
lastly is:4/6
4/6 = 4/6
1/5 = 4/20
now order, starting with the biggest denominator
because dividing 4 into the most pieces gives the least size per piece
or,
clearly, 1/5 < 1/3
both of those are less than 1/2, and 4/6 > 1/2