Yes - the word rational in this case means "can be written as a ratio".
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All fractions are rational numbers
Yes and as well as fractions are all rational numbers.
All rational numbers can be expressed as fractions whereas irrational numbers can't be expressed as fractions.
Not necessarily; pi / 2 is a fraction, but not a rational number. All fractions where both the numerator and denominator are integers are rational numbers, though.
Short answer - yes, fractions with whole numbers are rational. All whole numbers are rational. All fractions are rational. Rational numbers can be added to always make another rational number.