The Goal

Find

The Mistake

Find the mistake:

(Roll the mouse over the math to see a hint in red)

The Correction

(Roll the mouse over the area above to see the correction in blue)

An Explanation

Take care when subtracting fractions, especially when negative numbers are involved. In this case the result of 1/3 - 1 is 1/3 - 3/3 = (1-3)/3 = -2/3.