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To solve this addition problem, we will apply vertical addition:
We start with the given problem:
We perform the addition column by column:
Putting it all together, the sum of the two numbers is:
Therefore, the solution to the problem is .
788
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
Always start with the units column (rightmost) because if you need to carry over, it affects the next column to the left. Working left-to-right would mess up your carrying!
Double-check your column alignment first! Make sure 367 and 421 have their digits lined up properly by place value. Then re-add each column carefully.
No carrying needed here! Each column sum (7+1=8, 6+2=8, 3+4=7) is less than 10, so you can write each result directly in that column.
Use these steps: 1) Align digits carefully, 2) Add one column at a time, 3) Double-check each column sum, 4) Verify your final answer by adding again.
Add the numbers in reverse order: 421 + 367. If you get the same answer (788), you're correct! This catches most addition errors quickly.
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