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    GCF (HCF) of 18 and 54

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 18 and 54?

    Answer

    GCF (HCF) of 18 and 54 is
    18

    Common factors: 1, 2, 3, 6, 9, 18

    18 divides 54 (54 ÷ 18 = 3), so the GCF is the smaller number itself.

    18 = 2 × 32

    54 = 2 × 33

    Prime1854Lowest power
    2222
    3323332

    GCF = 2 × 32 = 18

    More with these numbers

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    What is the GCF (HCF) of 18 and 54. The GCF of 18 and 54 is 18 — 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
    18351
    183618
    18371
    18382
    18393
    18402
    18426
    18431
    18459
    18462
    18471
    18486
    18491
    18502
    18513
    185418
    18551
    18562
    18582
    18591
    18606
    18639
    18642
    18666
    18702
    187218
    18753
    18786
    18802
    18819

    FAQ

    What is the Greatest Common Divisor of 18 and 54?

    GCF (HCF) of 18 and 54 is 18

    How to find the GCF of 18 and 54?

    You can find the GCF of 18 and 54 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 18 and 54 is 18.

    What prime factors do 18 and 54 share?

    The prime factorizations of 18 and 54 have 2 × 3 × 3 in common, and multiplying those shared primes gives 18 — exactly the greatest common factor.

    How does the GCF reduce the fraction 18/54?

    Divide the numerator and the denominator by the GCF 18: 18 ÷ 18 = 1 and 54 ÷ 18 = 3. So 18/54 in lowest terms is 1/3.

    See Also