Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 1 - Section 1.2 - Fractions in Algebra - Concept and Vocabulary Check - Page 28: 12


least common denominator

Work Step by Step

When adding $\frac{1}{5}$ and $\frac{3}{4}$, there are many common denominators that we can use, such as 20, 40, 60, and so on. The given denominators, 4 and 5, divide into all of these numbers. However, the denominator 20 is the smallest number that 4 and 5 divide into. For this reason, 20 is called the least common denominator.
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