Numbers like –1, –2, –3, … that look "unnatural," "unreal," or even "absurd" vis-à-vis natural (or whole) numbers like 1, 2, 3, ….
Negative numbers serve as positive models in real life: debts or credit cards (money owed); Siberian temperatures (extreme cold weather); heights below sea level; elevators below ground level; and coffins being lowered (six feet under).
by MathPlus June 26, 2016
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