numbers that are whole numbers (1,2,3,4...) and numbers that are NOT negative. so anything above zero that does not have a decimal, percent or a fraction.
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Real numbers are all positive numbers except zero.
No.
All the positive real numbers are natural numbers.
Any positive number can be written as a quotient of two positive numbers or a quotient of two negative numbers. Any real number can be written as the quotient of two real numbers.
Not at all. The class of "natural" numbers are all positive, but the classes of "real" numbers and "rational" numbers include negative numbers.