To find the common multiples of two numbers you first need to express them as the product of their prime factors:
8 = 2x2x2
12 = 2x2x3
The next step is to identify any common primes. In this case, both numbers have two 2s as prime factors, so we can discard 2 of these. That leaves us with 2, 2, 2 and 3. Multiply these together to get the LCM:
2x2x2x3 = 24. To find the other common multiples, you simply times this LCM by any integer. That gives us 4 common multiples between 1 and 100. They are:
24, 48, 72, 96.
The common multiples of 8 and 12 that are between 1 and 100 are 22, 44, 66 and 88.
60.
Just 60.
Just 60.
The common multiples of 1 and 100 are any multiple of 100.
Just 60.
Just 60.
Just 60.
The common multiples of a number with itself are the multiples of that number. Thus all multiples of A between 1 and 100 are the common multiples of A and A between 1 and 100.
There is only one and it is 60
12, 24, 36, 48, 60, 72, 84, 96
the common multiples of 42 and 14 from 1-100 is 42,and 84