Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 34: 29



Work Step by Step

In order to add or subtract fractions, we start by making a common denominator (bottom of the fraction). Thus, we multiply 7/9 by 4/4 and 5/12 by 3/3 (this is legal because 4/4 and 3/3 equal one) to obtain: $\frac{28}{36}$+(-$\frac{15}{36}$)=$\frac{13}{36}$ (Recall, adding a negative is the same as subtraction.)
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