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: 58

Answer

LCD is 140.

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. $4=\underline2\times\underline2$ $14=2\times\underline7$ $20=2\times2\times\underline5$ $LCD=2\times2\times7\times5=4\times35=140$
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