# Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1 - Page 257: 100

$45$ is divisible by $5$ since it ends with $5$.

#### Work Step by Step

All positive numbers that end with either $0$ or $5$ are divisible by $5$. $45$ is divisible by $5$ since it ends with $5$.

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