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What is the greatest common factor of $8$ , $20$ , and $12$ ? $\newline$ _____

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Greatest common factor of three or four numbers

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Q. What is the greatest common factor of

8

,

20

, and

12

?

\newline

_____

List Factors of $8$ : Step $1$ : List the factors of $8$ . $\newline$ Calculation: $1$ \times $8$ = $8$ , $2$ \times $4$ = $8$ $\newline$ Factors of $8$ : $1$ , $2$ , $4$ , $8$
List Factors of $20$ : Step $2$ : List the factors of $20$ . $\newline$ Calculation: $1 \times 20 = 20$ , $2 \times 10 = 20$ , $4 \times 5 = 20$ $\newline$ Factors of $20$ : $1$ , $2$ , $4$ , $5$ , $10$ , $20$
List Factors of $12$ : Step $3$ : List the factors of $12$ . $\newline$ Calculation: $1 \times 12 = 12$ , $2 \times 6 = 12$ , $3 \times 4 = 12$ $\newline$ Factors of $12$ : $1$ , $2$ , $3$ , $4$ , $6$ , $12$
Identify Common Factors: Step $4$ : Identify the common factors of $8$ , $20$ , and $12$ . $\newline$ Common factors: $1$ , $2$ , $4$
Find Greatest Common Factor: Step $5$ : Find the greatest common factor (GCF). $\newline$ The highest number in the common factors list is $4$ . $\newline$ GCF of $8$ , $20$ , and $12$ : $4$

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