105
It is 210.
315
Multiples of seven include 7, 14, 21, 28, 35, 42, 49 and so on. For them to be common, they need to be compared to another set of multiples.
Multiples of 35 include 35, 70 and 105. For them to be common, they need to be compared to another set of multiples.
Multiples of 7 include 7, 14, 21, 28, 35 and so on. For them to be common, they need to be compared to another set of multiples.Itself and any other multiples of 7
Common multiples of 14 and 35 include 70, 140 and 210
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The multiples of 7 are 7, 14, 21, 28, 35, 42, etc.The multiples of 14 are 14, 28, 42, etc.The multiples of 21 are 21, 42, etc.The least common multiple (LCM) of 7, 14, and 21 is 42
there are infinite amount of common multiples.
The common multiples of 9 and 21 are 63, 126, 189 and so on.
Two common multiples of 21 and 15 are 105 and 315.