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.
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All fractions are rational numbers.
All numbers that can be expressed as fractions are rational
All whole numbers and fractions are rational numbers
All rational numbers can be expressed as a fractions
All rational numbers can be expressed as fractions whereas irrational numbers can't be expressed as fractions.