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The key steps to solve this addition problem using vertical addition are as follows:
The calculation looks like:
Therefore, the sum of 489 and 37 is .
526
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
When adding digits gives you 10 or more, you write the ones digit in that column and carry the tens digit to the next column on the left. Like 9 + 7 = 16: write 6, carry 1.
You start from the ones place because any carrying affects the next column to the left. If you started left, you'd miss the carries from the right columns!
Treat missing digits as zero. In 489 + 37, there's no hundreds digit in 37, so it's really 489 + 037 = 489 + 0 in the hundreds place.
Try adding in reverse order (37 + 489) or use subtraction: 526 - 37 should equal 489. You can also estimate: 490 + 40 ≈ 530, which is close to 526!
Sometimes you carry 2 or more! Like 8 + 7 = 15, so carry 1. Or 9 + 9 + 9 = 27, so carry 2. Just write the ones digit and carry whatever tens you have.
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