Answer :

surekha
for 100 200 300
100 200 300 400 500 (600) 700 800 900
200 400 (600) 800 1000
300 (600) 1200
so i guess u just have to list down
you find the prime factorization for each of the numbers and then write them down, then you take (from each of the numbers) the most amount of numbers from the prime factorization and list those down multiply them together and you should have your lcm