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 - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1: 52

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 $20$.
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