That's not convenient, because if you include decimal factors, then there are
an infinite number of them, and I'm somewhat busy just now.
The positive integer factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30 .
A few of the decimal factors include 0.1, 1.5, 0.2, 0.02, 0.3, 0.4, 0.04, 0.5, 0.6, 0.75 .
With the list now decreased by those ten, there are only an infinite number more.
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Of the numbers from 1 to 30, only 30 has all three of those numbers as factors.
The factors of 81 are: 1, 3, 9, 27, 81. The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30.
If that's 2 and 3, the answer is multiples of 6. If that's 2.3, factors only refer to whole numbers, not decimals.
Since 30 is a factor of 60, all of its factors are common.
Since 30 is a factor of 60, all the factors of 30 will be common to 60.