Math Boxing Integer Addition Subtraction

This isn't your dad's punching bag as it will throw punches if you don't answer the integer addition or subtraction problems correctly or you take too long.

Solve the integer addition or subtraction problem on the left and click on the box with the correct answer. You'll lose a glove (life) if the countdown timer reaches zero before you answer or you answer incorrectly.  As you complete a level the problems can get harder and the time gets shorter!  See how far you can go.