Answer
The greatest common divisor of the two numbers is $20$.
Work Step by Step
Factor each number to obtain:
$220=20(11)
\\400=20(20)$
20 and 11 have no common factors.
Thus, the greatest common divisor of the two numbers is $20$.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1 - Page 256: 52
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