Tom plays 9 rounds of golf.  He takes an average of 4 strokes per hole.  The par value per hole is 3.  How many strokes over par was he?
He took 4*9=<T>multiply(4, 9)=36 strokes
Par is 9*3=<T>multiply(9, 3)=27 strokes
So he was 36-27=<T>subtract(36, 27)=9 strokes over par
