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
178+119+5=302
178 + 8 = 186
It is: 156+178 = 334
89+234=923
234 + 231 = 465
1932 + 234 = 2,166
234 + 646 = 880
234 + 3747943 = 3748177
234 + 455 = 689