A game apparatus and a method for assisting in teaching the addition and subtraction
of positive and, especially, negative numbers, are based on the Null Theory of
Adding and Subtracting Positive and Negative Numbers. The apparatus comprises (a)
a plurality of positive units, (b) a plurality of negative units, (c) a demarcated
playing zone, and (d) a means for measuring the number of free positive units and
free negative units within the demarcated playing zone. Within the demarcated playing
zone, free positive units combine with free negative units zone to form null units,
with each null unit comprising an equal number of positive units and an equal number
of negative units. Each null unit preferably comprises one positive unit and one
negative unit.
