How do you calculate the LCM of 45 and 800?

Answer 1

Factor them.

3 x 3 x 5 = 45

2 x 2 x 2 x 2 x 2 x 5 x 5 = 800

Combine the factors, eliminating duplicates.

2 x 2 x 2 x 2 x 2 x 3 x 3 x 5 x 5 = 7200, the LCM