Zero Model, Negative & Positive Numbers

This zero model is intended for young children to make sense of mathematical ideas involving negative numbers. The essential idea is that every number has an additive inverse so that (+A) + (-A) =0. For example, (+1) + (-1) = 0 and (+5) + (-5) = 0. This big idea, together with the connections between addition and subtraction, can be used to explain why 0 – (-1)= +1, and eventually why (-1)(-1) = +1. It is really a fun perspective and has healthy implications for higher mathematics. And, yes, subtraction can be interpreted as “take away.” Thus, 0 – (-1) means taking (-1) from 0. Well, 0 is “(+1)+(-1)”, thus, the result is (+1).

There are two types of 3D models here. One allows the assertion of small magnets (5mm diameter x 1mm) into the small box on each side (at about 80% completion when printing). The magnets will then be fully sealed inside. The other model has the two pieces connected in a wedge structure. Be very careful when using small magnets with childre