Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 4 - Section 4.4 - Adding and Subtracting Like Fractions, Least Common Denominator, and Equivalent Fractions - Exercise Set - Page 263: 53


LCD is 45.

Work Step by Step

To find the least common denominator factor each denominator then multiply each factor the greatest number of times it occurs in either number. $9=\underline3\times\underline3$ $15=3\times\underline5$ $LCD=3\times3\times5=9\times5=45$
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