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    GCF of 15 and 20 (Greatest Common Factor)

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 15 and 20?

    Answer

    GCF of 15 and 20 is
    5

    (Five)

    Finding GCF for 15 and 20 using all factors (divisors) listing

    The first method to find GCF for numbers 15 and 20 is to list all factors for both numbers and pick the highest common one:

    All factors of 15: 1, 3, 5, 15

    All factors of 20: 1, 2, 4, 5, 10, 20

    So the Greatest Common Factor for 15 and 20 is 5

    Finding GCF for 15 and 20 by Prime Factorization

    The second method to find GCF for numbers 15 and 20 is to list all Prime Factors for both numbers and multiply the common ones:

    All Prime Factors of 15: 3, 5

    All Prime Factors of 20: 2, 2, 5

    As we can see there is only one Prime Factor common to both numbers. It is 5

    So 5 is the Greatest Common Factor of 15 and 20

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    See Also

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    What is the GCF of 15 and 20. The GCF of 15 and 20 is 5 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.
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    GCF Table

    Number 1Number 2GCF
    1555
    1563
    1593
    15105
    15123
    15161
    15171
    15183
    15205
    15213
    15221
    15231
    15243
    15255
    15261
    15273
    15281
    15291
    153015
    15321
    15333
    15355
    15363
    15381
    15405
    15423
    15441
    154515
    15483
    15491

    About "Greatest Common Factor" Calculator

    This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Divisor of 15 and 20? (The answer is: 5). Select the first number (e.g. '15') and the second number (e.g. '20'). After that hit the 'Calculate' button.
    Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder.
    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    FAQ

    What is the Greatest Common Divisor of 15 and 20?

    GCF of 15 and 20 is 5

    How to find the GCF of 15 and 20?

    You can find the GCF of 15 and 20 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 15 and 20 is 5.

    What prime factors do 15 and 20 share?

    The prime factorizations of 15 and 20 have 5 in common, and multiplying those shared primes gives 5 — exactly the greatest common factor.

    How does the GCF reduce the fraction 15/20?

    Divide the numerator and the denominator by the GCF 5: 15 ÷ 5 = 3 and 20 ÷ 5 = 4. So 15/20 in lowest terms is 3/4.

    See Also