Simplify :
555 - 55.5 - 5.555

Answer

To simplify the expression \( 555 - 55.5 - 5.555 \), we can follow these steps:

### Step 1: Rewrite the Expression
We start with the expression:
\[ 555 - 55.5 - 5.555 \]
We can rearrange it to group the subtractions:
\[ 555 - (55.5 + 5.555) \]

### Step 2: Add the Numbers in the Parentheses
Now, we need to calculate \( 55.5 + 5.555 \).

To do this, we can align the numbers by their decimal points:
```
55.500
+ 5.555
---------
```
Now, we can add them column by column:
- In the thousandths place: \( 0 + 5 = 5 \)
- In the hundredths place: \( 0 + 5 = 5 \)
- In the tenths place: \( 5 + 5 = 10 \) (write down 0 and carry over 1)
- In the units place: \( 5 + 1 + 0 = 6 \)

So, the sum is:
\[ 55.500 + 5.555 = 61.055 \]

### Step 3: Substitute Back into the Expression
Now we substitute back into our expression:
\[ 555 - 61.055 \]

### Step 4: Perform the Subtraction
Next, we perform the subtraction:
```
555.000
- 61.055
-----------
```
Aligning the numbers by their decimal points, we subtract:
- In the thousandths place: \( 0 - 5 \) (we need to borrow, so it becomes \( 10 - 5 = 5 \))
- In the hundredths place: \( 0 - 5 \) (again, we need to borrow, so it becomes \( 10 - 5 = 5 \))
- In the tenths place: \( 4 - 1 = 3 \) (after borrowing)
- In the units place: \( 4 - 6 \) (we need to borrow, so it becomes \( 14 - 6 = 8 \))
- In the hundreds place: \( 5 - 0 = 4 \)

So, the result of the subtraction is:
\[ 493.945 \]

### Final Answer
Thus, the simplified result of \( 555 - 55.5 - 5.555 \) is:
\[ \boxed{493.945} \]