Evaluate:
`315. 9 div 9`

Answer

To evaluate \( 315.9 \div 9 \), we can follow these steps:

### Step 1: Rewrite the Division
We start with the expression:
\[ 315.9 \div 9 \]
We can rewrite this as:
\[ \frac{315.9}{9} \]

### Step 2: Eliminate the Decimal
To eliminate the decimal, we can multiply both the numerator and the denominator by 10:
\[ \frac{315.9 \times 10}{9 \times 10} = \frac{3159}{90} \]

### Step 3: Perform the Division
Now we will divide \( 3159 \) by \( 9 \):
1. **Divide 31 by 9**: \( 9 \times 3 = 27 \) (subtract to get 4).
2. **Bring down the next digit (5)**: Now we have 45.
3. **Divide 45 by 9**: \( 9 \times 5 = 45 \) (subtract to get 0).
4. **Bring down the next digit (9)**: Now we have 9.
5. **Divide 9 by 9**: \( 9 \times 1 = 9 \) (subtract to get 0).

So, \( 3159 \div 9 = 351 \).

### Step 4: Adjust for the Decimal
Since we multiplied the original division by 10, we need to divide our result by 10:
\[ \frac{351}{10} = 35.1 \]

### Final Answer
Thus, the final answer is:
\[ \boxed{35.1} \]