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To solve this problem, let's perform vertical addition following these steps:
Step 1: Add the unit digits (rightmost column):
Step 2: Add the tens digits (middle column):
Step 3: Add the hundreds digits (leftmost column), including the carryover:
The sum of the numbers and is .
Therefore, the solution to the problem is .
904
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
When adding digits in a column gives you 10 or more, you write down the ones digit and carry the tens digit to the next column. For example, , so write 0 and carry 1.
You start from the ones place (rightmost) because that's where carrying begins! If you started from the left, you wouldn't know which columns need the carried digits added to them.
Your answer will be too small! In this problem, forgetting to carry the 1 would give you 804 instead of 904. Always double-check each column for sums of 10 or more.
Yes! Addition is commutative, meaning . This is actually a great way to check your work - try adding in reverse order!
Use estimation! Round 614 to 600 and 290 to 300. Since , your answer should be close to 900. Our answer of 904 makes sense!
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