All of their common factors do. Those are the numbers 1, 2, 3, 6, 9, and 18 .
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18 is.
90 percent of 40 is 36, since 0.90 x 40 = 36.
18 divides evenly into an infinite number of integers. The pattern starts with: 18, 36, 54, 72, 90, 108, 126, 144 . . . to infinity.
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A factor of a number is any number that the original number can divide by evenly. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18 and 36. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 and 90. The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84. The shared factors of all 3 numbers are 1, 2, 3 and 6.