Respuesta :
The LCM is the least common multiple and the lowest number that they are both divisible by is 21.
21 is the answer because
3:3 6 9 12 15 18 21
7:7 14 21
its super easy just do it like this
3:3 6 9 12 15 18 21
7:7 14 21
its super easy just do it like this