i only have a little bit because i needed an answer also but her are some
thermometer
taxes
sales
fractions of food
sorry thats all i got
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natural numbers are used in real life for counting, adding, subtracting and even for calculting money purposes
ℚ (fancy capital Q) is the set of rational numbers.
Negative numbers can be used for weather, when we talk about temperature that is below zero.
The imaginary axis is used in the definition of the complex numbers. Complex numbers are used in many fields in engineering, in particular - electric engineering, aerodynamics, acoustics etc.
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?