This lesson covers various real life situations that are represented by integers. For example if Larry gains 5 pounds, this is represented with the integer 5 or +5. The opposite integer would be -5, and this would represent Larry's weight LOSS of 5 pounds. Zero in this situation would be Larry's starting weight, or weight prior to any gain or loss.
Understand that positive and negative numbers are used together to describe quantities having opposite directions or values (e.g., temperature above/below zero, elevation above/below sea level, credits/debits, positive/negative electric charge); use positive and negative numbers to represent quantities in real-world contexts, explaining the meaning of 0 in each situation.