To find the product of 3
7
×
5
9
, Cameron simplified
3
7
to
1
7
and then multiplied the fractions
1
7
and
5
9
to find the product
5
63
. What is Cameron's error?

Cameron divided a factor in one of the numerators by the GCF but did not divide a factor in one of the denominators by the GCF. He should have simplified
5
9
to and multiplied
1
7
and to find the product .