28 into 18 best min fragment found: 7
  Cut up 28 sticks of length 18 like this:
    4 x (9 + 9)
    8 x (8 + 10)
    16 x (7 + 11)
  Reassemble as 18 sticks of length 28 like this:
    8 x (8 + 9 + 11)
    8 x (7 + 10 + 11)
    2 x (7 + 7 + 7 + 7)