`2.3 + 4.4 + 6.9 = "______"`

Explanation

To solve the expression \( 2.3 + 4.4 + 6.9 \), we will add the three decimal numbers step by step.

### Step 1: Align the numbers
First, we write the numbers one below the other, aligning the decimal points:

```
2.3
+ 4.4
+ 6.9
```

### Step 2: Add the numbers starting from the right
Now, we will add the numbers starting from the rightmost column (the tenths place):

- **Tenths place**: \( 3 + 4 + 9 \)
- \( 3 + 4 = 7 \)
- \( 7 + 9 = 16 \)
- Write down 6 and carry over 1 to the next column.

### Step 3: Add the next column (the units place)
Next, we add the numbers in the units place along with the carry-over:

- **Units place**: \( 2 + 4 + 6 + 1 \) (the 1 is the carry-over)
- \( 2 + 4 = 6 \)
- \( 6 + 6 = 12 \)
- \( 12 + 1 = 13 \)

### Step 4: Combine the results
Now, we combine the results from both columns:

- The result from the tenths place is 6.
- The result from the units place is 13.

So, we can write the final answer as \( 13.6 \).

### Final Answer:
Thus, \( 2.3 + 4.4 + 6.9 = 13.6 \).

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