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:
$3 \cdot 3 = 9$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
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 - Page 13: 67
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