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What is the greatest common factor of $9$ , $12$ , and $15$ ? $\newline$ ____

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Greatest common factor of three or four numbers

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Q. What is the greatest common factor of

9

,

12

, and

15

?

\newline

____

List Factors of $9$ : List the factors of $9$ . $\newline$ $1 \times 9 = 9$ $\newline$ $3 \times 3 = 9$ $\newline$ Factors of $9$ : $1$ , $3$ , $9$
List Factors of $12$ : List the factors of $12$ . $\newline$ $1 \times 12 = 12$ $\newline$ $2 \times 6 = 12$ $\newline$ $3 \times 4 = 12$ $\newline$ Factors of $12$ : $1$ , $2$ , $3$ , $4$ , $6$ , $12$
List Factors of $15$ : List the factors of $15$ . $\newline$ $1 \times 15 = 15$ $\newline$ $3 \times 5 = 15$ $\newline$ Factors of $15$ : $1$ , $3$ , $5$ , $15$
Identify Common Factors: Identify the common factors of $9$ , $12$ , and $15$ .
Factors of $9$ : $1$ , $3$ , $9$
Factors of $12$ : $1$ , $2$ , $3$ , $12$ $1$ , $12$ $2$ , $12$
Factors of $15$ : $1$ , $3$ , $12$ $7$ , $15$
Common factors: $1$ , $3$
Find Greatest Common Factor: Find the greatest common factor (GCF). $\newline$ The common factors are $1$ and $3$ . $\newline$ $3$ is greater than $1$ . $\newline$ GCF of $9$ , $12$ , and $15$ : $3$

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