That's like asking, "How do you use numbers in real life". Maybe you're referring to the negative portion, in which you use when you owe something. Postive numbers are used often also, say on a food label or a price tag. Zero, is used when you have nothing, bur you don't owe anyone. This would happen a lot, yes?
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they aren't used in real life, not unless you need them in a situation were you would need to use them.
Negative numbers can be used for weather, when we talk about temperature that is below zero.
-100
temperature.. -20 degrees 34 degree.. the numbers are integers. Of course you could have 20.4 degree, but often just integers are used
You use integers in golf, temperature (not body temp. because those sometimes use decimals), football yardage, weight, globes, and maps.