The answer is 179. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
123 + 56 = 179 - 97 = 82
123
123 plus 88 equals 211
456 + 789 + 123 + 123456789 = 123458157
112
123
123
1,234,568,013
111111111111111111111234
126
56 plus zero
444