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Find the greatest common factor of 63 and 42 .

Find the greatest common factor of $63$ and $42$ .

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Greatest common factor

Full solution

Q. Find the greatest common factor of

63

and

42

.

List factors of $63$ : List the factors of $63$ . $\newline$ Factors of $63$ : $1$ , $3$ , $7$ , $9$ , $21$ , $63$
List factors of $42$ : List the factors of $42$ . $\newline$ Factors of $42$ : $1$ , $2$ , $3$ , $6$ , $7$ , $14$ , $21$ , $42$
Identify common factors of $63$ and $42$ : Identify the common factors of $63$ and $42$ . $\newline$ Common factors of $63$ and $42$ : $1$ , $3$ , $7$ , $21$
Find greatest common factor of $63$ and $42$ : Find the greatest common factor (GCF) of $63$ and $42$ . $\newline$ The greatest common factor is the largest number in the list of common factors. $\newline$ GCF of $63$ and $42$ : $21$

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