GCF (HCF) of 66 and 243

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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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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.

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