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What is the greatest common factor of $18$ , $20$ , and $4$ ? $\newline$ ____

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Greatest common factor of three or four numbers

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Q. What is the greatest common factor of

18

,

20

, and

4

?

\newline

____

List Factors of $18$ : List the factors of $18$ . $\newline$ $1 \times 18 = 18$ $\newline$ $2 \times 9 = 18$ $\newline$ $3 \times 6 = 18$ $\newline$ Factors of $18$ : $1$ , $2$ , $3$ , $6$ , $9$ , $18$
List Factors of $20$ : List the factors of $20$ . $\newline$ $1 \times 20 = 20$ $\newline$ $2 \times 10 = 20$ $\newline$ $4 \times 5 = 20$ $\newline$ Factors of $20$ : $1$ , $2$ , $4$ , $5$ , $10$ , $20$
List Factors of $4$ : List the factors of $4$ . $\newline$ $1 \times 4 = 4$ $\newline$ $2 \times 2 = 4$ $\newline$ Factors of $4$ : $1$ , $2$ , $4$
Identify Common Factors: Identify the common factors of $18$ , $20$ , and $4$ . $\newline$ Factors of $18$ : $1$ , $2$ , $3$ , $6$ , $9$ , $18$ $\newline$ Factors of $20$ : $1$ , $2$ , $4$ , $20$ $4$ , $20$ $5$ , $20$ $\newline$ Factors of $4$ : $1$ , $2$ , $4$ $\newline$ Common factors: $1$ , $2$
Find Greatest Common Factor: Find the greatest common factor (GCF). $\newline$ The common factors are $1$ and $2$ . $\newline$ The greatest common factor is $2$ .

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