divers use it to calculate how far below sea level they are, you also use them for temperature, and business(profit, loss, etc.)
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Temperature in cold areas are negative. Below sea level is negative altitude. Degrees left on the world coordinates.
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The oldest published uses of negative numbers are from China, written sometime during the Han Dynasty (202 BC to 220 AD). They were used in India as early as the 7th century AD.
adding, subtracting, multiplying, dividing