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+21 into 13 best min fragment found: 21/4
+ Cut up 21 sticks of length 13 like this:
+ 3 x (6 + 7)
+ 6 x (11/2 + 15/2)
+ 12 x (21/4 + 31/4)
+ Reassemble as 13 sticks of length 21 like this:
+ 1 x (7 + 7 + 7)
+ 3 x (6 + 15/2 + 15/2)
+ 6 x (11/2 + 31/4 + 31/4)
+ 3 x (21/4 + 21/4 + 21/4 + 21/4)