Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 10 - Test - Page 729: 18


GCF = 15

Work Step by Step

To find the GCF, write each number as a product of primes: 45 = (3)(3)(5) 60 = (2)(3)(2)(5) To find the GCF, identify the common prime factors. Each number has a common prime factor of 5 and 3. The GCF is the product of these common prime factors. 3 x 5 = 15 15 is therefore the biggest number that goes both into 45 and 60.
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