Place Value Problem: Build Number with 9 Hundreds, 5 Tens, 1 One

To solve this problem, we need to construct a number based on given place values. Let's proceed with the solution:

• Step 1: Identify the digits for each place value.

The problem states:

- The number of ones is 1.
- The number of tens is 5.
- The number of hundreds is 9.

• Step 2: Use these digits to form the number.

In the decimal system:

• The ones place contributes $1 \times 1 = 1$.
• The tens place contributes $5 \times 10 = 50$.
• The hundreds place contributes $9 \times 100 = 900$.

We add these contributions to get the number:

$900 + 50 + 1 = 951$

Conclusion: Thus, the correct number according to the given place values is $951$.

Matching with provided choices:

• Choice 1: 915 – Incorrect
• Choice 2: 950 – Incorrect
• Choice 3: 951 – Correct
• Choice 4: 955 – Incorrect

Therefore, the answer is choice 3: $\textbf{951}$.