Least common multiple 84, 36, and 15

1260

Step-by-step explanation:

The least common multiple is the smallest positive number which is a multiple of the two. This means 84, 36, and 15 divide into it evenly. To find the multiple:

We list the prime factors of each number. We note how many times each occurs. We multiply each factor the greatest number of times it occurs in a number.

84: 2*2*3*7

36: 2*2*3*3

15: 3*5

LCM: 2*2*3*3*5*7 = 1260