The answer is 682. 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.
678 + 75 = 753
789 + 678 = 1467
234 + 678 = 912
567 + 678 = 1,245
9 plus 2 plus 2 plus 45-678 is equal to -620.
777
2222900
267
707.000999
5357
678
562,864