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: 8

Answer

21

Work Step by Step

Multiples of 7: 7, 14, 21, 28, 35 In order to find the LCM of 3 and 7, we must find the first multiple of 7 that is also divisible by 3. 7 and 14 are not divisible by 3. $21\div3=7$ Therefore, 21 is the LCM of 3 and 7.
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