Question

What is the easiest way to find the LCM of 30 an 42?

Answer 1

Hey there,

One way I know is to list all the mutiples between 30 and 42. If there is more than one multipl then keep searching until you find theone that is less than the others and there's none left but that one multiple which is the LCM of 30 and 42.

Hope that helps!!

Answer 2

To find the least common multiple for the integers 30 and 42, we start by making a factor tree for each of our integers.

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Notice that our two's match up as factors of each of our integers. The number three also matches up as factors of each of our integers. When finding the least common multiple, we can simply multiply all of our factors together. Since the two's match up and so does the number 3, we only multiply by a two and a three once. Then, we multiply the 5 which does not match up and the 7 which does not match up.