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    GCF (HCF) of 7 and 28

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 7 and 28?

    Answer

    GCF (HCF) of 7 and 28 is
    7

    Common factors: 1, 7

    7 divides 28 (28 ÷ 7 = 4), so the GCF is the smaller number itself.

    7 — prime

    28 = 22 × 7

    Prime728Lowest power
    2—22—
    7777

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

    GCF = 7

    More with these numbers

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    What is the GCF (HCF) of 7 and 28. The GCF of 7 and 28 is 7 — 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
    751
    781
    791
    7101
    7111
    7121
    7131
    7147
    7151
    7161
    7171
    7181
    7191
    7201
    7217
    7241
    7251
    7287
    7301
    7357
    7361
    7427
    7431
    7461
    7497
    7511
    7567
    7637
    71001
    71057

    FAQ

    What is the Greatest Common Divisor of 7 and 28?

    GCF (HCF) of 7 and 28 is 7

    How to find the GCF of 7 and 28?

    You can find the GCF of 7 and 28 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 7 and 28 is 7.

    What prime factors do 7 and 28 share?

    The prime factorizations of 7 and 28 have 7 in common, and multiplying those shared primes gives 7 — exactly the greatest common factor.

    How does the GCF reduce the fraction 7/28?

    Divide the numerator and the denominator by the GCF 7: 7 ÷ 7 = 1 and 28 ÷ 7 = 4. So 7/28 in lowest terms is 1/4.

    See Also