There are infinitely many of them. An easy one to work out is 10*12 = 120
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10 is both a factor and a multiple of itself.
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
10 or any multiple of 10.
The Greatest Common Multiple (GCM) of both 10 and 3 is 1.
10. (10*1=10, 5*2=10)