This trick requires for the fractions to be in the special form
X (X+1)/(X+2) - Y (Y+1)(Y+2)
An example of this is 6 7/8 - 1 2/3.
The answer X-Y (X-Y)/(denominators multiplied together) so the solution to the exapmle above is
(6-1) (6-1)/(8*3) = 5 5/24
This applies to both positive and negative answers
Example: 2 3/4 - 6 7/8
(2-6) (2-6)(4*8) = -4 4/34 = -4 1/8 REMEMBER TO REDUCE!
-Kevin
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