Two:
The factor pairs of 15 are 1 x 15 and 3 x 5.
15 and 3030 and 4515 and 45
You find a factor pair take the number that you want to find the factor pair of and divide it by a number. If the answer come out evenly then that's your factor pair EX. Factor pairs of 150 1 and 150 2 and 75 3 and 50 5 and 30 6 and 25 10 and 15
The factor pairs of 135 are: 1, 135 3, 45 5, 27 9, 15
The factors of 15 are 1, 3, 5, 15. There are two factor pairs.
You are thinking of 225.
The factor pairs of 15 are (15,1)(5,3) Neither of them add up to 11. No integers fulfill your request.
15 and 30 have a GCF of 15. There are other such pairs.
Oh, dude, factor pairs for 15? Like, let me think for a sec... Alright, so 1 and 15 are a pair, then there's 3 and 5. That's it, man. Like, those are the only pairs you're gonna get for 15. Hope that helps, or whatever.
15 and 15000 have a greatest common factor of 15
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
The factor pairs of 150 are 1*150, 2*75, 3*50, 5*30, 6*25, and 10*15