When the numerator and denominator are coprime - ie have no factor in common other than 1.
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If the algebraic expression can be written in the form of a(x)/b(x) where a(x) and b(x) are polynomial functions of x and b(x) ≠0, then the expression is a rational algebraic expression.
It is a rational number because it can be expressed as a fraction in the form of 899/2500 in its simplest form
109, like any integer, can be written as a fraction in simplest form by putting it over 1.
It is a rational fraction in its simplest form. It may be a proper fraction or an improper (or mixed) fraction. For example, 5/6 or 6/5 ( or 1 1/5).
679 is an integer and not a fraction. However, it can be expressed in rational form as 679/1.