Add ones place digits: Add the ones place digits from both numbers. 2 (from 402) plus 6 (from 376) equals 8. Write down the 8 in the ones place of the answer.
Add tens place digits: Add the tens place digits from both numbers. 0 (from 402) plus 7 (from 376) equals 7. Write down the 7 in the tens place of the answer.
Add hundreds place digits: Add the hundreds place digits from both numbers. 4 (from 402) plus 3 (from 376) equals 7. Write down the 7 in the hundreds place of the answer.
Combine all digits: Combine all the digits in their respective places to get the final answer. The hundreds place is 7, the tens place is 7, and the ones place is 8. So, the final answer is 778.