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    GCF (HCF) of 3 and 42

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 3 and 42?

    Answer

    GCF (HCF) of 3 and 42 is
    3

    Common factors: 1, 3

    3 divides 42 (42 ÷ 3 = 14), so the GCF is the smaller number itself.

    3 — prime

    42 = 2 × 3 × 7

    Prime342Lowest power
    2—2—
    3333
    7—7—

    — = 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 3 and 42. The GCF of 3 and 42 is 3 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.
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    FAQ

    What is the Greatest Common Divisor of 3 and 42?

    GCF (HCF) of 3 and 42 is 3

    How to find the GCF of 3 and 42?

    You can find the GCF of 3 and 42 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 3 and 42 is 3.

    What prime factors do 3 and 42 share?

    The prime factorizations of 3 and 42 have 3 in common, and multiplying those shared primes gives 3 — exactly the greatest common factor.

    How does the GCF reduce the fraction 3/42?

    Divide the numerator and the denominator by the GCF 3: 3 ÷ 3 = 1 and 42 ÷ 3 = 14. So 3/42 in lowest terms is 1/14.