All the numbers are factors of 10.
10 = 10 x 1
30 = 10 x 3
90 = 10 x 9
270 = 10 x 27
In addition, each number is three times larger than the previous number.
10
10 x 3 = 30
30 x 3 = 90
90 x 3 = 270
So, if you are asking for the greatest common factor, it is 10 and the common factors would be 1, 2, 5, and 10. If you are trying to determine the next element in the sequence, it is 270 x 3 = 810.
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The number of integers that are multiples of both 6 and 10 is infinite. Here are the first few: 30, 60, 90, 120, 150, 180, 210, 240, 270, 300 . . .
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, . . .30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, . . .
27027*10 = 27090*3 = 270
90, 180, 270, 360, 450
90