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To solve this problem, we'll follow a systematic vertical addition process:
Thus, the resulting sum of is .
102910
\( \begin{aligned} &12 \\ +& \\ &~~2 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
Starting from the units place (rightmost column) ensures proper carrying! When you get sums ≥ 10, you carry the extra to the next column. Working left-to-right would mess up this carrying process.
When two digits add up to 10 or more, you write down the units digit and carry the tens digit to the next column. For example: → write 0, carry 1.
Write small numbers above the columns as reminders! When , write a tiny 1 above the tens column to remember your carry.
Your answer will be wrong! Always double-check each column to make sure you've included any carried amounts. In step 3: .
Yes! Try reverse subtraction: ✓. If you get back to your original first number, your addition is correct!
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