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There is no "most common multiple". To find all common multiples, you start by finding the least common multiple. All other common multiples are multiples of this least common multiple.
Since 18 is a multiple of 6, it is automatically the LCM.
You need at least two numbers to find a common multiple.
The Least Common Multiple (LCM) is 15.
add six plus six and ta da you have a multiple of six