18 into 10 best min fragment found: 4
  Cut up 18 sticks of length 10 like this:
    6 x (10)
    12 x (4 + 6)
  Reassemble as 10 sticks of length 18 like this:
    4 x (6 + 6 + 6)
    6 x (4 + 4 + 10)