There is an infinite number of common multiples for 36 and 54. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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A multiple is any number that goes into another number. A common multiples of 6 and 9 is the number 18.
18, 36, 54
18, 36, 54
18, 36, 54, 72, 90
18, 36, 54 and so on. It's all multiples of 18. Since 6 = 3 x 2 and 9 = 3 x 3, you have multiples of [3 x 3 x 2] which is 18.