The answer is 412. 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.
The greatest common factor of 234 , 178 = 2
468
468
234 + 678 = 912
234 + 231 = 465
234 + 12 = 246
234 + 3747943 = 3748177
234 + 455 = 689
234 + 646 = 880
1932 + 234 = 2,166
89+234=923
234 + 1000 = 1234