What is GCF for 9 and 13?

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Answer 1 · 2016-11-03T04:10:11

GCF of $9$ and $13$ is $1$ .

The factors of $9$ are $3xx3$ , and

as $13$ is a prime number, its only factor is $13$ .

Note that there are no common factors between them.

Such numbers are called coprimes or relatively primes.

GCF of such numbers is always $1$ .

Answer 2 · 2016-11-04T20:07:04

So GCF (greatest common factor) is 1

Using prime numbers as factors: also including 1

$color(blue)(ul("Very important fact;")" 1 is not a prime numbers")$

$color(brown)("The only factors of a prime number is 1 and the number itself")$

$color(white)(1)9->color(red)(1)xx3xx3$
$13->color(red)(1)color(white)(xx3xx3)xx13color(brown)( larr" Thus 13 is a prime number")$

The only common factor is 1

So GCF (greatest common factor) is 1