GCF and LCM of 22 and 27

The GCF of 22 and 27 is 1. The LCM of 22 and 27 is 594.

• GCF (greatest common factor, also called GCD or HCF) of 22 and 27 = 1
• LCM (least common multiple) of 22 and 27 = 594

22 and 27 share no common factor except 1, so they are coprime (relatively prime). When two numbers are coprime their LCM is simply their product: 22 × 27 = 594.

Method 1: list the factors (GCF)

Factors of 22: 1, 2, 11, 22.
Factors of 27: 1, 3, 9, 27.
Common factors: 1. The greatest of these is 1.

Method 2: prime factorization

22 = 2 × 11
27 = 3 × 3 × 3

GCF: multiply the prime factors both numbers share: there are none, so the GCF is 1.

LCM: multiply every prime the maximum number of times it appears in either number: 2 × 3 × 3 × 3 × 11 = 594.

Method 3: Euclidean algorithm (GCF)

Divide the larger number by the smaller and repeat with the remainder until it is 0. The last non-zero remainder is the GCF.

1. 27 = 1 × 22 + 5
2. 22 = 4 × 5 + 2
3. 5 = 2 × 2 + 1
4. 2 = 2 × 1 + 0

The last non-zero remainder is 1, so GCF(22, 27) = 1.

LCM by listing multiples

Multiples of 22: 22, 44, 66, 88, 110, 132, 154, 176, 198, ...
Multiples of 27: 27, 54, 81, 108, 135, 162, 189, 216, 243, ...
The first number in both lists is 594.

Check: GCF × LCM = product

1 × 594 = 594 = 22 × 27. This always holds for two numbers, so you can find the LCM as (22 × 27) ÷ 1 = 594.

Simplifying the fraction 22/27

22/27 is already in lowest terms because the GCF of 22 and 27 is 1.

GCF and LCM of similar pairs

See also: factors of 22 · factors of 27.

Different numbers? Use the GCF and LCM calculator (any amount of numbers) or browse all GCF and LCM pairs.