The answer is 1 and 3.
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The factors of 9 are 1, 3, and 9. The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 15 are 1, 3, 5, and 15. The common factors of 9, 12, and 15 are 1 and 3. Therefore, the least common factor (the smallest common factor) is 1.
Factors of 9 include 1, 3, and 9. Factors of 15 include 1, 3, 5, and 15. Factors common to both 9 and 15 are 1 and 3.
Since 15 is a factor of 45, its factors are the common factors of 15 and 45. The factors of 15 are 1, 3, 5, and 15. The factors of 45 are 1, 3, 5, 9, 15, and 45. The factors they have in common are 1, 3, 5, and 15.
The factors of 15 are: 1, 3, 5, 15The factors of 27 are: 1, 3, 9, 27The common factors are: 1, 3
The factors of 45 are: 1, 3, 5, 9, 15 and 45. The factors of 675 are: 1, 3, 5, 9, 15, 25, 27, 45, 75, 135, 225 and 675. Therefore their common factors are: 1, 3, 4, 9, 15 and 45.