Question

find the LCM of 15, 18 and 30 by prime factorization​

Answer 1

LCM(15, 18 and 20) = 180

The least common multiple 180 is a product of common & odd prime factors between the integers which is divisible by each one an integer of this same group. The step by step work for LCM of 15, 18 and 20 may useful to understand how to find LCM for two or three numbers.

How to find LCM(15, 18, 20)?

Follow the below steps to find the least common multiple of given group of integers or whole numbers 15, 18 and 20 by using the most efficient and easiest method.

Problem & Workout :

step 1 Address input parameters & values.

Integers: 15 18 20

lcm (15, 18, 20) = ?

step 2 Arrange the group of numbers in the horizontal form with space or comma separated format

15, 18 and 20

step 3 Choose the divisor which divides each or most of the integers of in the group (15, 18 and 20), divide each integers separately and write down the quotient in the next line right under the respective integers. Bring down the integer to the next line if the integer is not divisible by the divisor. Repeat the same process until all the integers are brought to 1.

LCM of 15, 18 and 20

3 15 18 20

2 5 6 20

5 5 3 10

3 1 3 2

2 1 1 2

1 1 1

step 4 Multiply the divisors to find the lcm of 15, 18 and 20

3 x 2 x 5 x 3 x 2 = 180

LCM(15, 18, 20) = 180

The least common multiple for three numbers 15, 18 and 20 is 180

Answer 2

its your answer......90