(7 x 6) + (7 x 13) = 7 x 19 = 133
7(5 + 6)
GCF(7, 42) = 77 = 7*1 and 42 = 7*6 So 7 + 42 = 7*(1 + 6).
87+42+78 = 207
67+8+9+42 = 126
The sum of 21 and 21 is 42.
14 and 3
6 + 0 + 36 = 42
(6 * 30) + (15 * 42) = 180 + 630 = 810.
6 and 7
18 and 24.
12
The GCF of 1218 and 42 is 42. The GCF of 12, 18 and 42 is 6.