Since 45 is a factor of 900, all of its factors are common.
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The common factors of 45 and 63 are 1, 3, and 9.
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 common factors of 45 and 72 are: 1, 3, and 9
The factors of 18 are 1, 2, 3, 6, 9, and 18.The factors of 45 are 1, 3, 5, 9, 15, and 45.The common factors of 18 and 45 are 1, 3, and 9.
The factors of 45 are 1, 3, 5, 9, 15, 45. For them to be common, they need to be compared to another set of factors.