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    GCF for 4, 12 and 15

    "Greatest Common Factor of 3 Numbers" Calculator
    Greatest Common Factor of
    ,
    and

    What's the Greatest Common Factor (GCF) of 4, 12 and 15?

    Answer

    GCF of 4, 12 and 15 is
    1

    Common factors: 1

    Only 1 divides all three: no prime is a factor of each of 4, 12 and 15.

    Pairs do share factors — GCF(4, 12) = 4, GCF(12, 15) = 3 — just none greater than 1 common to all three.

    4 = 22

    12 = 22 × 3

    15 = 3 × 5

    Prime41215Lowest power
    22222——
    3—33—
    5——5—

    — = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

    GCF = 1

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    https://calculat.io/en/number/greatest-common-factor-of-3-numbers/4--12--15Copy
    <a href="https://calculat.io/en/number/greatest-common-factor-of-3-numbers/4--12--15">What is the GCF of 4, 12 and 15? - Calculatio</a>Copy
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    What is the GCF of 4, 12 and 15? The GCF of 4, 12 and 15 is 1 — the largest number that divides all three with no remainder. Step-by-step solution for three numbers.
    https://calculat.io/en/number/greatest-common-factor-of-3-numbers/4--12--15/generated.jpgCopy

    GCF Table

    1st2nd3rdGCF
    14121
    24122
    34121
    44124
    45121
    46122
    47121
    48124
    49121
    410122
    411121
    412124
    412131
    412142
    412151
    412164
    412171
    412182
    412191
    412204
    412211
    412222
    412231
    412244
    412251
    412262
    412271
    412284
    412291
    412302

    FAQ

    What's the Greatest Common Factor (GCF) of 4, 12 and 15?

    GCF of 4, 12 and 15 is 1

    What prime factors do 4, 12 and 15 share?

    None at all: 4, 12 and 15 have no prime factor in common, so the only positive integer dividing all three is 1 and their GCF is 1.

    Can you get the GCF of 4, 12 and 15 two numbers at a time?

    Yes. The GCF of 4 and 12 is 4, and the GCF of 4 and 15 is 1 — the same answer, because the greatest common factor is associative and does not depend on the order of the three numbers.

    How does the GCF simplify the ratio 4 : 12 : 15?

    Divide every term by the GCF 1: 4 ÷ 1 = 4, 12 ÷ 1 = 12 and 15 ÷ 1 = 15. So 4 : 12 : 15 in lowest terms is 4 : 12 : 15, and no whole number other than 1 divides all three of those.

    See Also