## Prealgebra (7th Edition)

Published by Pearson

# Chapter 4 - Section 4.4 - Adding and Subtracting Like Fractions, Least Common Denominator, and Equivalent Fractions - Exercise Set: 56

LCD is 90.

#### 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. $15=3\times\underline5$ $90=\underline2\times\underline3\times\underline3\times5$ $LCD=2\times3\times3\times5=6\times15=90$

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