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    GCF (HCF) of 66 and 243

    "Greatest Common Factor" Calculator
    Greatest Common Factor of
    and

    What is the Greatest Common Divisor of 66 and 243?

    Answer

    GCF (HCF) of 66 and 243 is
    3

    Common factors: 1, 3

    3 divides both: 66 ÷ 3 = 22, 243 ÷ 3 = 81 — and 22 and 81 share no factor but 1, so no larger number divides both.

    66 = 2 × 3 × 11

    243 = 35

    Prime66243Lowest power
    22——
    33353
    1111——

    — = 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 66 and 243. The GCF of 66 and 243 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
    662286
    662291
    662302
    6623133
    662322
    662331
    662346
    662351
    662362
    662373
    662382
    662391
    662406
    662411
    6624222
    662433
    662442
    662451
    662466
    662471
    662482
    662493
    662502
    662511
    662526
    6625311
    662542
    662553
    662562
    662571

    FAQ

    What is the Greatest Common Divisor of 66 and 243?

    GCF (HCF) of 66 and 243 is 3

    How to find the GCF of 66 and 243?

    You can find the GCF of 66 and 243 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 66 and 243 is 3.

    What prime factors do 66 and 243 share?

    The prime factorizations of 66 and 243 have 3 in common, and multiplying those shared primes gives 3 — exactly the greatest common factor.

    How does the GCF reduce the fraction 66/243?

    Divide the numerator and the denominator by the GCF 3: 66 ÷ 3 = 22 and 243 ÷ 3 = 81. So 66/243 in lowest terms is 22/81.

    See Also