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Composite numbers can be used by businessmen, shopkeepers etc. These people use calculations a lot in their daily life.
It is possible to live a long and productive life without ever multiplying a negative number outside of a classroom.
Negative rational numbers are used in the same way that negative whole numbers are used: they are simply the additive inverses of their positive counterparts.
Negative fractions are rational numbers less than 0. In life, if a trend is decreasing (for example, sales at a restaurant, obesity rates, etc), it's rate of decrease would be portrayed as negative.
Counting Numbers, Whole Numbers. You can't use Integers as that includes Negative numbers and there isn't a negative number of dolphins.