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What is the greatest common factor of $20$ and $15$ ? $\newline$ ____

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Greatest common factor

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Q. What is the greatest common factor of

20

and

15

?

\newline

____

List Factors of $20$ : Step $1$ : List the factors of $20$ . $\newline$ Factors of $20$ : $1, 2, 4, 5, 10, 20$
List Factors of $15$ : Step $2$ : List the factors of $15$ . $\newline$ Factors of $15$ : $1$ , $3$ , $5$ , $15$
Identify Common Factors: Step $3$ : Identify the common factors of $20$ and $15$ . Common factors: $1$ , $5$
Find Greatest Common Factor: Step $4$ : Find the greatest common factor. $\newline$ The greatest common factor is $5$ , since it's the largest number common to both lists.

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