You're money will either go up or down in value, because each country has different money values. So if you were going to another country, your money will either raise in value (positive) or lower in value (negative).
Temperature is another way integers are shown in real life, because the temperature is always either over 0 or below zero. An example would be at night it could be -2 degrees and half way through the day it might be +23 degrees.
In music there are charts of things like the top 50 songs. In the charts, you either get points and go up (positive points) or you get negative points and go down.