Find the GCF 15 , 64

$15$ , $64$

Find the common factors for the numerical part:

$15, 64$

The factors for $15$ are $1, 3, 5, 15$ .

The factors for $15$ are all numbers between $1$ and $15$ , which divide $15$ evenly.

Check numbers between $1$ and $15$

Find the factor pairs of $15$ where $x \cdot y = 15$ .

$\begin{array}{c} x & y \\ 1 & 15 \\ 3 & 5 \end{array}$

List the factors for $15$ .

$1, 3, 5, 15$

The factors for $64$ are $1, 2, 4, 8, 16, 32, 64$ .

The factors for $64$ are all numbers between $1$ and $64$ , which divide $64$ evenly.

Check numbers between $1$ and $64$

Find the factor pairs of $64$ where $x \cdot y = 64$ .

$\begin{array}{c} x & y \\ 1 & 64 \\ 2 & 32 \\ 4 & 16 \\ 8 & 8 \end{array}$

List the factors for $64$ .

$1, 2, 4, 8, 16, 32, 64$

List all the factors for $15, 64$ to find the common factors.

$15$ : $1, 3, 5, 15$

$64$ : $1, 2, 4, 8, 16, 32, 64$

The common factors for $15, 64$ are $1$ .

$1$

The GCF (HCF) of the numerical factors $1$ is $1$ .

$1$