A zero pair is a pair of numbers that, when added together, equal zero. In other words, they cancel each other out.
Step-by-step explanation: Here's why: Imagine your place on the rope is to the right of the zero, at the '1' position. Your friend is standing to the left of the zero, at the '-1' position. Where is the ribbon? It's at the 0! So, this means that '1' and '-1' are a zero pair - when added together, they equal zero and the positive cancels out the negative.
