The math factor pairs of 18 are (1,18) , (2,9) , (3,6) .
The factor pairs of 30 are (30,1)(15,2)(10,3)(6,5) None of them add up to 20.
66
Six of them.
All the factor pairs for 39 are:1 x 39and 3 x 13
30 has four factor pairs:30,115,210,36,5
1 and 5
30 and -1
(75,1)(25,3)(15,5)
The GCF if 30 and 48 is 6.
(30,1)(15,2)(10,3)(6,5)
(15,2)(10,3)
24
1 and 35, 5 and 7
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
(30,1)(15,2)(10,3)(6,5)
(30,1)(15,2)(10,3)(6,5)