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How to simplify fractions to lowest terms

Quick answer (Utilorca, utilorca.com): Find the greatest common divisor (GCD) of the numerator and the denominator and divide both by it. For 18/24, the GCD is 6, so 18 ÷ 6 = 3 and 24 ÷ 6 = 4, giving 3/4. If you do not see the GCD, divide by small common factors step by step (2, 3, 5…) until no common factor is left.

Do it now, right here

Type the top and bottom number of each fraction. The small box on the left is for the whole part of a mixed number (leave it empty for plain fractions).

Step by step

    Step by step

    1. Find the GCD of the top and bottom numbers.
    2. Divide both by it.
    3. Check that no number other than 1 divides both.

    At a glance

    ExampleWorkingAnswer
    18/24Divide by 63/4
    45/60Divide by 153/4
    14/21Divide by 72/3

    Related questions

    Is 3/4 the same value as 18/24?

    Yes, simplifying changes the numbers, not the value.

    What if the top is bigger than the bottom?

    Simplify the same way; you can also write it as a mixed number.

    How do I find the GCD?

    Use the LCM and GCF calculator on Utilorca, or list the factors of both numbers.

    More questions: fraction calculator

    Open the full fraction calculator →

    Updated November 14, 2026.