The GCF is 9.
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Any multiples of 18 that differ by 18, like 216 and 234, 234 and 252, 252 and 270, 270 and 288.
The lowest common multiple is 9594
There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
The LCM of 123 and 234 is 9,594.
Zero doesn't have factors. 1 1,2 1,3 1,2,4 1,5