12 + 23 + 45 + 67 + 16 + 18 + 45 = 226
-45 + 18 = -27
The GCF of 18 and 27 is 9.
18 + 27 = 45
The sum of -27 and 45 is 18.
It is: (15+18)+12 = 45
18 + 36 + 45 + 9 + 9 + 54 + 27 + 72 + 81 = 351
20/45 + 18/45 = 38/45
18+(9*3) = 45
45 + 48 = 93
-1 + -45
-45 plus 512 plus 45 plus 56 = 568