In non-decimal form, it is either a whole number of written as a fraction (a ratio) of two whole numbers. In decimal form, it is either terminating or (after a finite number of digits) recurring.
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how do you identify opposite and absolute value of a rational number
A rational number can be expressed as a fraction whereas an irrational number can't be expressed as a fraction.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes.
Yes, but only if the rational number is 0.