First we are going to use the prime factorization
30 90 210 I 2 First, divide all numbers by 2, because they are even numbers.
15 45 105I 5 Then, divide all numbers by 5 because they are multiples of 5
3 9 21 I 3 Then, divide all numbers by 3 because they are multiples of 3
1 3 7 I 3 Then, divide by 3
1 1 7 I 7 Then , divide by 7
1 1 1
Finally, we multiply our prime factors: 2*5*3*3*7 = 630
Our final answer is : 630