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There are many situations where integers are simply not enough. However, "real numbers" are mainly of theoretical importance; for most practical situations, numbers that have a limited number of decimals work quite well.
Daily transactions, calculations are very easy to work out by all irrespective of literacy.
Yes, all natural numbers are real numbers. Natural numbers are a subset of real numbers, so not all real numbers are natural numbers.
All rational numbers are real numbers.
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.