The only non-natural whole number is 0.
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An Irrational number is a non-rational number. A rational number is one that can be represented as one whole number over another (non-zero) whole number. 0.06789 = 6789/100000 → one whole number over another whole number → 0.06789 is a rational number →No. 0.06789 is not an irrational number.
Yes. -10 = -10/1 which is of the form of one whole number over another whole number. Rational numbers have the form of one whole number over another whole number. Thus -10 is rational.
A rational number is one where a whole number is over another whole number. 3 and 2 are both whole numbers so 3/2 is a rational number.
Any whole number can be written as a fraction, with the whole number in the numerator, and the number one in the denominator. Compare this to the definition of "rational number".
One fifth is a rational fraction. It is not a whole number and cannot be made into one.