The GCF is 7.
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The greatest common denominator of any set of denominators is infinite.
In mathematics, the greatest common divisor is also known as the greatest common factor (gcf), highest common factor (hcf), greatest common measure (gcm), or highest common divisor.
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.
The greatest common multiple is an infinite amount and not very practical for problem solving.
To find the LCM of two numbers you first express them as their prime factors. In this case we have: 9 = 3x3 11 = 11 The next step would be to identify any common factors. In this case there are none, so simply take all the factors (3, 3 and 11) and multiply them together: 3x3x11 = 99 Thus the LCM of 9 and 11 is 99.