Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.2 - Prime and Composite Numbers - Problem Set 1.2: 67

Answer

$9$

Work Step by Step

Factor each number completely to obtain: $63 = 7 \cdot 3 \cdot 3 \\81 = 3 \cdot 3 \cdot 3 \cdot 3$ Since two 3s are common to both, the greatest common factor of the two given numbers is: $3 \cdot 3 = 9$
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