LCM of 5, 6 and 7 is

2 |5,6,7

3 |5,3,7

5 |5,1,7

7 |1,1,7

|1,1,1

now multiply 2,3,5 and 7 you will get

2x3x5x7 = 210

So 210 is the Least common multiple of 5,6 and 7

2 |5,6,7

3 |5,3,7

5 |5,1,7

7 |1,1,7

|1,1,1

now multiply 2,3,5 and 7 you will get

2x3x5x7 = 210

So 210 is the Least common multiple of 5,6 and 7