Subtract 855 from 4003: Vertical Format Multi-Digit Subtraction

$\begin{aligned} &4003 \\ -& \\ &~~855 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve the subtraction problem $4003 - 855$, we will perform the operation step-by-step, ensuring we manage the borrowing process correctly:

• Step 1: Align the numbers for subtraction:
  $4003$
  $- 855$
  It's important to start from the rightmost digit.
• Step 2: Subtract the digits in the units place:
  $3 - 5$. Since 3 is less than 5, we need to borrow. There is nothing in the tens place to borrow, so we move to the hundreds.
  Borrow 1 from the hundreds place (turning the 0 into a 9 in the tens place), and reborrow 1 from there. So, the new setup is:
  $3$ becomes $13$ (in units place), $0$ becomes $9$ (in tens place), and reduce $0$ to $9$ in hundreds place.
• Step 3: Perform the subtraction in the units place now:
  $13 - 5 = 8$, so write down 8.
• Step 4: Move to the tens place:
  $9 - 5 = 4$, write down 4.
• Step 5: Move to the hundreds place:
  $9 - 8 = 1$, write down 1.
• Step 6: Finally, address the thousands place:
  $3 - 0 = 3$, write down 3.

The result of $4003 - 855$ is $3148$.

The correct choice that matches this result is option 3: $3148$.