This cannot be answered because the common multiples of any two or more numbers are infinite.
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The Least Common Multiple (LCM) for 18 15 is 90.
The greatest common factor is 2 and the least common multiple is also 2.
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The greatest common multiple of 10 and 18 is infinite.However, I suspect you want either:the greatest common factor of 10 and 18 which is the largest number which divides both 10 and 18 and is 2; orthe lowest common multiple of 10 and 18 which is smallest number into which both 10 and 18 divide (ie the smallest number which is a multiple of both 10 and 18) and is 90
The greatest common factor of 15 and 18 is three.