Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.3 The Rational Numbers - Exercise Set 5.3 - Page 287: 153

Answer

Makes sense

Work Step by Step

Makes sense, because when multiplying we only need to multiply the denominators to get the denominator and multiply the numerators to get the numerator. But when adding them we have to find a common denominator, then bring the two fractions to the common denominator and then add the numerators.
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