This cannot be answered because the common multiples of any two or more numbers are infinite.
The Least Common Multiple (LCM) for 42 56 is 168.
There is no highest common multiple of 56, 98 and 168. Their highest common factor, which you may have meant, is 14.
Highest common factor is 7.
It is: 14
The least common multiple of the numbers 2,842 and 56 is 11,368.The least common multiple of the numbers 28, 42 and 56 is 168.
168
LCM(42, 56, 140) = 840
2184
The GCF is 14.
The LCM is: 168
The LCM is: 840
168