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: 48

Answer

$6$

Work Step by Step

Factor each number completely to obtain: $66=6(11) = 2(3)(11) \\90=5(18) = 5(2)(9) =5(2)(3)(3)$ Thus, the greatest common divisor is $2(3)=6$.
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