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To solve this problem, we'll follow these steps:
Therefore, the sum of and is .
9122
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
When two digits add up to 10 or more, you write the ones digit in your answer and carry the tens digit to the next column. For example: 4 + 8 = 12, so write 2 and carry 1.
You start from the ones place (rightmost column) because any carrying affects the next column to the left. Working left to right would mean redoing columns when carries happen!
Write small carry numbers above each column as you work. This helps you remember what to add: original digits + any carry from the previous column.
Try adding the numbers in reverse order: . You should get the same answer! You can also use estimation: 6300 + 2800 ≈ 9100.
If the leftmost column creates a carry (like 6 + 2 + 1 = 9 here), just write it as part of your final answer. Sometimes this creates an extra digit in your sum!
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