20 into 9 best min fragment found: 4
  Cut up 20 sticks of length 9 like this:
    20 x (4 + 5)
  Reassemble as 9 sticks of length 20 like this:
    5 x (5 + 5 + 5 + 5)
    4 x (4 + 4 + 4 + 4 + 4)