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    GCF (HCF) of 1 and 8

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 1 and 8?

    Answer

    GCF (HCF) of 1 and 8 is
    1

    Common factors: 1

    1 divides every number: the GCF with 1 is always 1, and the LCM is the other number itself — here 8.

    1 — no prime factors

    8 = 23

    Prime18Lowest power
    2—23—

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

    GCF = 1

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    What is the GCF (HCF) of 1 and 8. The GCF of 1 and 8 is 1 — 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
    111
    141
    151
    161
    171
    181
    191
    1101
    1121
    1131
    1161
    1201
    1271
    1561
    11001

    FAQ

    What is the Greatest Common Divisor of 1 and 8?

    GCF (HCF) of 1 and 8 is 1

    How to find the GCF of 1 and 8?

    You can find the GCF of 1 and 8 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 1 and 8 is 1.

    What prime factors do 1 and 8 share?

    1 and 8 have no prime factor in common, so the only integer that divides both of them is 1 and their GCF is 1.

    How does the GCF reduce the fraction 1/8?

    Divide the numerator and the denominator by the GCF 1: 1 ÷ 1 = 1 and 8 ÷ 1 = 8. So 1/8 in lowest terms is 1/8.

    Are 1 and 8 coprime?

    Yes, 1 and 8 are coprime (relatively prime) because their Greatest Common Factor is 1.

    See Also