Loss or negative growth, mostly in economic matters
temperature
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An overdrawn balance on your bank account is a negative number !
Jeopardy.
In the real world you can use the order of rational numbers. This is used a lot in math.
Math class, thermometers.
No. Inventory and engineering work need negative numbers to measure. Also, how can we measure the temperature if it's freezing cold without negative numbers? Integers are needed for calculations and measurements in this world.