Question

Find the H. C. F and L. C. M of
and 2/5, 7/10 and 8/15.​

Answer 1

Answer:

Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60

Multiples of 7: 7, 14, 21, 28, 35, 42, 56, 63

Multiples of 21: 21, 42, 63

Find the smallest number that is on all of the lists. We have it in bold above.

So LCM(6, 7, 21) is 42

Answer 2

Answer:

How to Find the Least Common Multiple LCM

This LCM calculator with steps finds the LCM and shows the work using 5 different methods:

Listing Multiples

Prime Factorization

Cake/Ladder Method

Division Method

Using the Greatest Common Factor GCF

How to Find LCM by Listing Multiples

List the multiples of each number until at least one of the multiples appears on all lists

Find the smallest number that is on all of the lists

This number is the LCM

Example: LCM(6,7,21)

Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60

Multiples of 7: 7, 14, 21, 28, 35, 42, 56, 63

Multiples of 21: 21, 42, 63

Find the smallest number that is on all of the lists. We have it in bold above.

So LCM(6, 7, 21) is 42