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    GCF (HCF) of 12 and 27

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 12 and 27?

    Answer

    GCF (HCF) of 12 and 27 is
    3

    Common factors: 1, 3

    3 divides both: 12 ÷ 3 = 4, 27 ÷ 3 = 9 — and 4 and 9 share no factor but 1, so no larger number divides both.

    12 = 22 × 3

    27 = 33

    Prime1227Lowest power
    222——
    33333

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

    GCF = 3

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    What is the GCF (HCF) of 12 and 27. The GCF of 12 and 27 is 3 — 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
    1293
    12102
    12131
    12142
    12153
    12164
    12171
    12186
    12191
    12204
    12213
    12222
    122412
    12251
    12262
    12273
    12284
    12306
    12324
    12333
    12342
    12351
    123612
    12393
    12404
    12411
    12426
    12431
    12444
    12453

    FAQ

    What is the Greatest Common Divisor of 12 and 27?

    GCF (HCF) of 12 and 27 is 3

    How to find the GCF of 12 and 27?

    You can find the GCF of 12 and 27 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 12 and 27 is 3.

    What prime factors do 12 and 27 share?

    The prime factorizations of 12 and 27 have 3 in common, and multiplying those shared primes gives 3 — exactly the greatest common factor.

    How does the GCF reduce the fraction 12/27?

    Divide the numerator and the denominator by the GCF 3: 12 ÷ 3 = 4 and 27 ÷ 3 = 9. So 12/27 in lowest terms is 4/9.

    See Also