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All natural numbers are also real numbers, but all real numbers are not necessarily natural numbers because natural numbers are positive whole numbers. Real numbers are any number on the number line, which includes irrational numbers like pi and sqrt2. Thus only the positive natural numbers are both natural and real. Hope this is not too long-winded!
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65 is rounded to the nearest whole number.
Any number that terminates and repeats. 0.44444 is a rational number, fractions are rational and whole numbers are too.
You can square any real number (complex ones too) so the domain is all real numbers.