Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 3 - Adding and Subtracting Fractions - 3.3 Adding and Subtracting Unlike Fractions - 3.3 Exercises - Page 221: 45

Answer

Only like fractions can be added or subtracted. Rewriting the fractions using the LCM as the denominator results in an equation that includes like fractions.

Work Step by Step

If the least common multiple is not readily apparent, you can alternatively use the product of the denominators as the common multiple.
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