The sum of the greatest 4-digit number and the smallest 3-digit number is

Options

A. 7000
B. 9899
C. 10099
D. 10999

Answer

To solve the problem of finding the sum of the greatest 4-digit number and the smallest 3-digit number, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the greatest 4-digit number**:
- The greatest 4-digit number is 9999.

2. **Identify the smallest 3-digit number**:
- The smallest 3-digit number is 100.

3. **Calculate the sum**:
- Now, we add the two numbers together:
\[ 9999 + 100 \]

4. **Perform the addition**:
- Adding these two numbers:
\[ 9999 + 100 = 10099 \]

5. **Final Result**:
- Therefore, the sum of the greatest 4-digit number and the smallest 3-digit number is 10099.

### Summary:
The answer to the question is 10099.