There is really no such thing as a "highest common multiple". Once you find a common multiple of a set of numbers, you can keep adding the CM 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.
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The Greatest Common Factor of 99, 132, 165: 33
The common factors are: 1, 3, 11, 33.
LCM is the highest power of each common factor, so factor all 3 numbers 22 is [2 11] 33 is [3 11] 44 is [2 2 11] or [2² * 11] highest common factors are 2² * 3 * 11 = 132 ◄ Another way is to take out the quick factor of 11 from all, and find the LCM for {2 3 4} which is 12 and multiply that by the 11 to get 132
One quarter of 132 is 33.
The GCF for 33 and 111 is 3.