The GCF is: 40
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"GCF" means Greatest Common Factor. "Common" means "same for both".There's no such thing as a common factor of just one number. You can't haveanything common until you have two or more numbers.
The answer would be 480 because the largest even factor of 96 is 48 and if you add a zero to each, it gives you 960 divided by 2 equals 480.
Least Common Multiple (LCM) for 64 240 is 960
The common factors of 960 and 2145 are: 1, 3, 5 & 15.
There is really no such thing as a "greatest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.