Elementary Algebra

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: 46

Answer

$115=5\times23$.

Work Step by Step

Since the last digit of 115 is 5, 115 is divisible by 5. When we divide 115 by 5, we get 23. 23 is not divisible by any number except 1 and is therefore a prime number. Since 5 and 23 are prime factors, the prime factorization of 115 is $5\times23$.
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