Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 3 - Adding and Subtracting Fractions - Summary Exercises - Operations with Fractions - Page 236: 38



Work Step by Step

The least common multiple (LCM) of a group of numbers is the smallest number that is divisible by all of the numbers in the group. In order to find the LCM of 4, 12, and 21, we can find the smallest multiple of 21 that is divisible by both 4 and 12. 21- not divisible by either 42- not divisible by either 63- not divisible by either 84- divisible by both $84\div4=21$ $84\div12=7$ Therefore, the LCM of 4, 12, and 21 is 84.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.