As soon as cavemen started trading handfuls of corn for women or bags of meat,
they were using integers. They didn't know it, however, because the word hadn't
been invented yet. It was several centuries, indeed millenia, before the word was
invented, but once it became available, it certainly made math a lot easier.
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The integers are -11, -9 and -7.
Many of them.
I'm thinking that a stock marketer uses integers to symbolize if a stock has gone up or down.
Because otherwise you would only know how to subtract and add with the same integers. Not a particularly useful skill unless just those integers turned up!
It is 50.