A) 12 si 8
12 : 1, 2, 3, 4, 6, 12;
8 : 1, 2, 4, 8;
(12, 18) = 4;
B) 10 si 25
10: 1, 2, 5, 10;
25: 1, 5, 25;
(10, 25) = 5;
C) 18 si 24
18: 1 , 2, 3, 6, 8, 18;
24: 1, 2, 3, 4, 6, 8, 12, 24,
(18, 24) = 6;
D) 15 si 25
15: 1, 3, 5, 15;
25: 1, 5, 25;
(15, 25) = 5;
E) 20 si 28
20: 1, 2, 4, 5, 10, 20;
28: 1, 2, 4, 7, 14, 28;
(20, 28 )= 4;
F) 8 si 16
8: 1, 2, 4, 8;
16: 1, 2, 4, 8, 16;
(8, 16 )= 8;
G) 24 si 22
24: 1, 2, 3, 4, 6, 8, 12, 24;
22: 2, 11, 22;
(24, 22)= 2.