the highest common factor of the numbers 12, 16 and 18 is 2.
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The highest common factor is 4
The highest common factor for 18 and 16 is 2.
The GCF is 16.
There is no highest common multiple of any two or more numbers, for whatever value you come up with I can always add the LOWEST common multiple of the numbers to get an even higher common multiple. If you meant LOWEST common multiple, then LCM(8, 12, 16) = 48 If you mean the highest common FACTOR (the largest integer that divides into all the numbers) then HCF(8, 12, 16) = 4
There is no limit to the size of the highest common multiple. Highest common factor is 2 and lowest common multiple is 176.