What is the lowest common multiple of 42 and 54?

Answer 1

To find the LCM of two numbers, you first need to break those numbers down into their prime factors. For 42 and 54, this can be done as follows:

42 = 2x3x7

54 = 2x3x3x3

The next step is to identify any common factors. In this case, there are common prime factors of 2 and 3, which means one of each can be discarded. Take every other prime factor (7, 2, 3, 3 and 3) and multiply them together to get the LCM:

7x2x3x3x3=378

Thus the lowest common multiple of 42 and 54 is 378.