Flow chart of LCM of two numbers?

Answer 1

(start)

[calculate gcd]

[calculate product]

[divide]

(stop)

Answer 2

If you already know the grid method for GCF, the LCM is found by multiplying the numbers down the left side with the numbers at the bottom of the grid. If you don't know the grid method, I'm not going to be able to draw it here as it involves a tic tac toe board and vertical lines are nearly impossible in this format. If you think about it, it's just like the ladder method with a few extra lines. If you think about it further, the grid method, like the rainbow, tree, ladder, fireworks, lattice and cake methods are all the same things: different ways to notate the process of finding and comparing the prime factorizations of given numbers. It doesn't matter where you write them on the page.

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the highest amount of each factor.

2 x 3 x 5 x 7 = 210, the LCM