Factor both the numerator and denominator down to prime factors:
in exponential notation:
24 = 23 × 3
30 = 2 × 3 × 5
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Calculate the greatest common factor, GCF:
Multiply all the common prime factors, by the lowest exponents.
gcd (23 × 3; 2 × 3 × 5) = 2 × 3
Calculate the greatest common factor, GCF, online calculator
Divide both the numerator and the denominator by their greatest common factor, GCF:
24/30 =
(23 × 3)/(2 × 3 × 5) =
((23 × 3) ÷ (2 × 3)) / ((2 × 3 × 5) ÷ (2 × 3)) =
22/5 =
4/5