Review the concepts of additive inverses and adding positive and negative integers. Relate understanding to the subtraction of integers. This is done with either the use of "Algeblocks" (any square or tile manipulative should do) or a number line. The lesson calls for your class to sing a silly song as they walk the number line, which you could skip if your class is more mature. They also use calculators to grasp the skill. Worksheet links with practice exercises are included.