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To solve this problem, we'll use vertical addition step-by-step:
Therefore, the sum of 857 and 23 is .
The correct choice is Choice 4: .
880
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
Because 10 means 1 ten and 0 ones! The digit 10 doesn't exist in our number system. You must carry the 1 to the tens place and write 0 in the ones place.
You'll get the wrong answer! In this problem, forgetting the carried 1 would give you 870 instead of 880. Always remember to add any carried digits to the next column.
Align by place value! Put ones under ones, tens under tens, hundreds under hundreds. Think of it like stacking blocks - each column must line up perfectly.
It's much harder! Adding right to left lets you handle carrying naturally. If you go left to right, you might need to change previous digits when you carry, making it confusing.
No problem! Just imagine invisible zeros in front of shorter numbers. So 23 becomes 023, making it easier to line up with 857.
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