There is really no such thing as a "highest 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 highest multiple.
The Least Common Multiple (LCM) for 24 30 42 is 840.
The LCM of 24 and 42 is 168Tthe least common multiple of the numbers 42 and 24 is 168.
The Least Common Multiple (LCM) for 42 36 24 is 504.
Least Common Multiple (LCM) for 42 and 24 is 168.
2, 12, 6, 7 are common multiples of 24 and 42
168
The Least Common Multiple (LCM) of 12, 42, and 24 is 168.
The LCM of 11, 24, and 42 is 1848.
The LCM of 24, 42, and 84 is 168.
The GCF is 6.
168
504