There is really no such thing as a "greatest 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 greatest multiple.
28 multiples are 7,4,1,2,14,28, 63 multiples are 1.63.3.3.7 greatest is 7
Common multiples of 7 and 4 include any multiple of 28.
This cannot be answered because the common multiples of any two or more numbers are infinite.
The common multiples of 4 and 7 are numbers that are divisible by both 4 and 7. To find the common multiples, you can list out the multiples of each number and then identify the numbers that appear in both lists. The common multiples of 4 and 7 are 28, 56, 84, 112, and so on, as they are divisible by both 4 and 7.
Since 4 divides 12, they are the first 7 multiples of 12.
2,56,84
The Greatest Common Factor of 4, 7, 20: 1
It's impossible to tell because multiples go on forever ,so the biggest might be 42 because both 6 and 7 have that multiple in common.
21 is the LCM, but multiples go on forever, so there is no upper limit, or greatest common multiple.
7 and any multiple of 7. Any multiples of 7 that differ by 7.
21 and 28
28 and 56