25 into 12 best min fragment found: 5
  Cut up 25 sticks of length 12 like this:
    5 x (6 + 6)
    20 x (5 + 7)
  Reassemble as 12 sticks of length 25 like this:
    10 x (5 + 6 + 7 + 7)
    2 x (5 + 5 + 5 + 5 + 5)