I suggest you do the divisions. If you get an integer, it is a multiple. If you get digits after a decimal point, it is not.18
18 is a multiple of 6 because it can be evenly divided by 6 to equal 3. 20 is not a multiple of 6 because it cannot be evenly divided by 6. 20/6 = 3.3333... .
6, 12 and 18
5 multiples of:5: 5, 10, 15, 20, 256: 6, 12, 18, 24, 30
Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, 40, and so on. Multiples of 6 are 6, 12, 18, 24, 30, 36, and so on.
Multiples of 2 are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, and so on. Multiples of 6 are 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, and so on.
3: 3, 6, 9, ... 6: 6, 12, 18, ... 18: 18, 36, 54, ... The lcm(3, 6, 18) = 18, so the multiples of 18 are common multiples of all of them.
18 and all the multiples of 18.
3, 6, 9, 12, 15, 18
Multiples of 6 include 6, 12 and 18. For them to be common, they need to be compared to another set of multiples.
2, 4, 6, 8, 10, 12, 14, 16, 18, 20.
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
2, 6 and 18 are numbers that are multiples of 2 and factors of 18.2, 6 and 18
2, 4, 6, 8, 10, 12, 14, 16, 18, 20.