Question

find the LCM of the following
a) 16,-12,-4,8,28
b)-30,-15,10,20​

Answer 1

Answer:

a - 336

b- 60

explanation:

For each prime factor, find where it occurs most often as a factor and write it that many times in a new list.

The new superset list is

2, 2, 3, 5

Multiply these factors together to find the LCM.

LCM = 2 x 2 x 3 x 5 = 60

In exponential form:

LCM = 22 x 31 x 51 = 60

LCM = 60

Therefore,

LCM(10, 15, 20, 30) = 60

Answer 2

Answer:

a) LCM is 336

Step-by-step explanation:

first take the least factor of the the number and start factorising accordingly