Daily transactions, calculations are very easy to work out by all irrespective of literacy.
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Virtually every number in one's daily life is a real number. The only exceptions occurwhen an individual is a mathematician, a Physicist, or an electrical engineer workingwith AC.So considering the population as a whole, it's nearly correct to say that the real numbershave all of the importance, and no non-real numbers are important at all.
Umm... first of all this question isn't grammatically correct, but I'll answer the question, "How useful are whole numbers in real life?". They are useful to know when you when you are taking an algebra class:)
-3 is a real, rational, whole integer. But then, -- All integers are real rational whole numbers. -- All whole numbers are real rational integers. -- All rational numbers are real. -- All counting numbers are real, rational, whole integers.
Decimals are real numbers. Furthermore, integers and whole numbers are the same thing.
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.