Math Tank Subtraction

Drive your tank safely through the minefield by using your subtraction skills.  Mines with correct answers are safe to go over while mines with the wrong answer will disable your tank.  Try and get to the end of each level without tripping a mine.

Use the subtraction problem in the hint found before the mines to figure out which mine is safe.  The mine with the correct answer is a dud and is safe to drive over.  Click the tank to stop and start it and tap to the left or right of the tank to shift it over in that direction.