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To solve this problem, we'll follow these steps:
Now, let’s work through each step:
Step 1: Align the numbers vertically:
Step 2: Add the right-most column (the units).
, write in the units place.
Step 3: Move to the next column to the left (the tens).
, write in the tens place (no carrying needed).
Step 4: Move to the left-most column (the hundreds).
remains as there is nothing to add, so write in the hundreds place.
Thus, the result when you add the numbers is:
Therefore, the sum of and is .
379
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
Place value alignment is crucial! Each column represents a different place value (units, tens, hundreds). When numbers aren't aligned properly, you're adding the wrong digits together.
That's normal! In this problem, 27 has no hundreds digit, so we treat it as having 0 in the hundreds place. Just make sure the rightmost digits line up in the units column.
Yes! Always start from the rightmost column (units place) and work left. This ensures you handle any carrying correctly when sums exceed 9.
You'll need to carry over! Write down the units digit and carry the tens digit to the next column. In this problem, no carrying was needed since all column sums were less than 10.
Try reverse checking: subtract one of the original numbers from your answer. ✓ This confirms your addition is correct!
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