Because they divide evenly into 396 with no remainder.
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The factors of 396 are: 1, 2, 3, 4, 6, 9, 11, 12, 18, 22, 33, 36, 44, 66, 99, 132, 198, 396 The factors of 468 are: 1, 2, 3, 4, 6, 9, 12, 13, 18, 26, 36, 39, 52, 78, 117, 156, 234, 468 The common factors are: 1, 2, 3, 4, 6, 9, 12, 18, 36
Factors of 18 are 1, 2, 3, 6, 9 and 18. Factors of 22 are 1, 2, 11 and 22.
The common factors of 18 and 22 are: 1 and 2
Any multiple of 396, like 396, 792, 1188 and so on.
The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72. The factors of 22 are: 1, 2, 11, 22.