Natural numbers are all the counting numbers excluding zero and all negative numbers. People use these in everyday life to count, add, subtract, and even with money purposes
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.
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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.
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The square root of any negative number is not a real number. denoted as i for imaginary because it does not exist, in the normal concept of numbers.Complex numbers (which include real and imaginary numbers) are combinations of real & imaginary numbers.While these numbers do not exist in the everyday concept of numbers, they are important in concepts of electricity and waves.
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Real and Complex. Real numbers are your everyday numbers that most people are familiar with and Complex numbers are Real numbers mixed with imaginary numbers. Of course this is a VERY BROAD oversimplification, and the question is somewhat vague in that there are other "types" of numbers that are used, but I think this is the answer you are looking for.
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