162, 324, 486, 648, 810, 972, 1134, 1296, 1458, 1620, . . .
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81 and 162 are both multiples of 3. In mathematics, a number that can be divided by another number without leaving a remainder is said to be divisible by that number. Both 81 and 162 can be evenly divided by 3, making them multiples of 3.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, . . .
To find the common multiples of 54 and 90, first list the multiples of each number. The multiples of 54 are 54, 108, 162, 216, etc. The multiples of 90 are 90, 180, 270, 360, etc. The common multiples of 54 and 90 are numbers that appear in both lists, such as 180 and 360.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180
72, 81, 90, 99, 108, 117, 126, 135, 144, 153, 162, . . .