1, 2, 3, 6, 9, 18
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The multiples of 18 in ascending order are 12345678
They are all factors of 18, but they are not all the factors of 18. Don't forget the number itself.
Since 18 is a factor of 54, all of its factors are common.
The factors of 18 are 1, 2, 3, 6, 9, 18. For them to be common, they need to be compared to another set of factors.
The factors of 18 are 1, 2, 3, 6, 9, and 18 The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30