Question

Find the L.c.m andH.c.f 15,18,21 using prime factorization​

Answer 1

Answer:

step 1 Address input parameters & values.

Integers: 15 18 21

lcm (15, 18, 21) = ?

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

15, 18 and 21

step 3 Choose the divisor which divides each or most of the integers of in the group (15, 18 and 21), 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 21

3 15 18 21

5 5 6 7

6 1 6 7

7 1 1 7

1 1 1

step 4 Multiply the divisors to find the lcm of 15, 18 and 21

3 x 5 x 6 x 7 = 630

LCM(15, 18, 21) = 630

The least common multiple for three numbers 15, 18 and 21 is 630