What is the least common multiple of 15 9 5 4?

Answer 1

To find the least common multiple of four numbers, you first break those numbers up into their prime factors. For 15, 9, 5 and 4 this can be done as follows:

15 = 3x5

9 = 3x3

5 = 5

4 = 2x2

The next step is to identify any common factors. In this case, there are two numbers that share a 3, so one of these can be discarded. There are also two numbers that share a 5, so one of these can be discarded. Take all the other primes (3, 5, 3, 2 and 2) And multiply them together to find the LCM:

3x5x3x2x2 = 180

Thus the least common multiple of 15, 9, 5 and 4 is 180.