Solve Decimal Addition: 4.003 + 1.007 Step by Step

To solve this problem, we will follow these steps:

• Step 1: Write the numbers $4.003$ and $1.007$ beneath each other such that their decimal points are aligned.
• Step 2: Add the numbers column by column starting from the rightmost decimal place.

Let's execute these steps:

Step 1: Align the numbers by decimal points.

  4.003
+ 1.007
------

Step 2: Perform the addition from right to left.

• In the thousandths column, add $3 + 7 = 10$; write down $0$ and carry over $1$.
• In the hundredths column, add $0 + 0 + 1 \text{(carry)} = 1$.
• In the tenths column, add $0 + 0 = 0$.
• In the units column, add $4 + 1 = 5$.

Write the resulting sum: $5.001$.

  4.003
+ 1.007
------
  5.001

Thus, the solution to the problem is $5.001$.