The GCF of 4 and 22 is 2. The LCM of 4 and 22 is 44.
Factors of 4: 1, 2, 4.
Factors of 22: 1, 2, 11, 22.
Common factors: 1 and 2. The greatest of these is 2.
4 = 2 × 2
22 = 2 × 11
GCF: multiply the prime factors both numbers share: 2 = 2.
LCM: multiply every prime the maximum number of times it appears in either number: 2 × 2 × 11 = 44.
Divide the larger number by the smaller and repeat with the remainder until it is 0. The last non-zero remainder is the GCF.
The last non-zero remainder is 2, so GCF(4, 22) = 2.
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, ...
Multiples of 22: 22, 44, 66, ...
The first number in both lists is 44.
2 × 44 = 88 = 4 × 22. This always holds for two numbers, so you can find the LCM as (4 × 22) ÷ 2 = 44.
Divide the top and bottom by the GCF 2: 4/22 = 2/11.
| Numbers | GCF | LCM |
|---|---|---|
| 2 and 4 | 2 | 4 |
| 3 and 4 | 1 | 12 |
| 4 and 5 | 1 | 20 |
| 4 and 6 | 2 | 12 |
| 4 and 7 | 1 | 28 |
| 4 and 8 | 4 | 8 |
| 2 and 22 | 2 | 22 |
| 3 and 22 | 1 | 66 |
| 5 and 22 | 1 | 110 |
| 6 and 22 | 2 | 66 |
| 7 and 22 | 1 | 154 |
| 8 and 22 | 2 | 88 |
See also: factors of 4 · factors of 22.
Different numbers? Use the GCF and LCM calculator (any amount of numbers) or browse all GCF and LCM pairs.