why is 4/6 less than 5/7
If you take 4/6, you divide so it will be 0.6667... and then if you take 5/7 you divide again, and then it will be 0.7143...
lcm = 2 x 3 x 7 = 424/6 = 28/425/7 = 30/4228/42 is less than 30/424/6 is less than 5/7