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To solve this problem, we'll follow these steps for vertical addition:
Now, let's work through the addition:
Step 1: Add the ones digits: . Place in the ones place of the result.
Step 2: Add the tens digits: . Place in the tens place, and carry over to the hundreds place.
Step 3: Add the hundreds digit: (including the carry-over). Place in the hundreds place of the result.
Thus, the sum is .
Therefore, the solution to the problem is .
609
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
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