GCF (HCF) of 27 and 81

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What is the Greatest Common Divisor of 27 and 81?

Answer

GCF (HCF) of 27 and 81 is
27

Common factors: 1, 3, 9, 27

27 divides 81 (81 ÷ 27 = 3), so the GCF is the smaller number itself.

27 = 33

81 = 34

Prime2781Lowest power
3333433

GCF = 33 = 27

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GCF Table

Number 1Number 2GCF
27311
27321
27333
27341
27351
27369
27381
27393
27401
27423
27431
27459
27461
27483
27491
27501
27513
275427
27551
27561
27573
27603
27639
27641
27753
278127
27909
271001
2710827
271251

FAQ

What is the Greatest Common Divisor of 27 and 81?

GCF (HCF) of 27 and 81 is 27

How to find the GCF of 27 and 81?

You can find the GCF of 27 and 81 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 27 and 81 is 27.

What prime factors do 27 and 81 share?

The prime factorizations of 27 and 81 have 3 × 3 × 3 in common, and multiplying those shared primes gives 27 — exactly the greatest common factor.

How does the GCF reduce the fraction 27/81?

Divide the numerator and the denominator by the GCF 27: 27 ÷ 27 = 1 and 81 ÷ 27 = 3. So 27/81 in lowest terms is 1/3.

See Also