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To solve this problem, we'll proceed with vertical addition of 257 and 51:
Start adding from the right-most side (units column):
Units Column: . There is no carrying over needed as the sum is below 10.
Tens Column: . Here, we write down 0 and carry over 1 to the hundreds column.
Hundreds Column: from the original numbers plus the 1 carried over gives .
The resulting sum is:
Therefore, the solution to the problem is .
308
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
We start with the ones column because carrying works from smaller to larger place values. If you start left, you might miss carries that affect the final answer!
When a column adds up to 10 or more, you write the ones digit and carry the tens digit to the next column left. Like : write 0, carry 1.
Carry whenever your column sum is 10 or greater. Write down the ones digit, then add the tens digit to the next column to the left.
Treat missing digits as zero. In this problem, 51 has no hundreds digit, so we add in the hundreds column (plus any carried digit).
Yes! Try estimation: 257 is close to 260, and 51 is close to 50. So 260+50=310, which is very close to our answer of 308 ✓
No worries! Cross out your work neatly and start over. It's better to redo it carefully than to have the wrong answer.
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