Chapter CSB1.2, Problem 5E

To determine

To find: The GCF of $21,45$

Answer to Problem 5E

GCF $=3$

Explanation of Solution

Given information: $21,45$

Calculation: The prime factors of $21,45$ are,

  $\begin{array}{l}21=3\cdot 7\\ 45=3\cdot 3\cdot 5\end{array}$

Thus, GCF of $21,45$ is 3.