`1.004 -0.4` is equal to :

Options

A. `0.640`
B. 1
C. `0.006`
D. `0.604`

Answer

To solve the problem \(1.004 - 0.4\), we can follow these steps:

### Step-by-Step Solution:

1. **Align the Decimals**:
Write the numbers in a column, aligning the decimal points:
```
1.004
- 0.400
```

2. **Add Zeros if Necessary**:
Since \(0.4\) can be written as \(0.400\), this helps in aligning the digits properly.

3. **Subtract the Numbers**:
- Start from the rightmost digit:
- In the thousandths place: \(4 - 0 = 4\)
- In the hundredths place: \(0 - 0 = 0\)
- In the tenths place: \(0 - 4\) requires borrowing.
- Borrow 1 from the whole number (1 becomes 0), making it \(10 - 4 = 6\).
- In the whole number place: \(0 - 0 = 0\).

4. **Combine the Results**:
- Putting it all together, we have:
```
0.604
```

5. **Final Answer**:
Therefore, \(1.004 - 0.4 = 0.604\).

### Final Answer:
\[ \text{The answer is } 0.604 \]