Basic College Mathematics (10th Edition)

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

Chapter 3 - Adding and Subtracting Fractions - 3.2 Least Common Multiples - 3.2 Exercises - Page 211: 19

Answer

120

Work Step by Step

The LCM of a group of numbers is the smallest number into which the original numbers divide. Therefore, we can list the multiples of each number, and the number that first appears as a multiple of all of the numbers will be the LCM. 20- 20, 40, 60, 80, 100, 120 24- 24, 48, 72, 96, 120 30- 30, 60, 90, 120 Therefore, 120 is the LCM of 20, 24, and 30.
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