Place Value Problem: Converting 1 Hundred, 2 Tens, and 9 Ones to Standard Form

To solve this problem, we'll follow these steps:

• Identify the contribution of each place value.
• Sum these contributions to determine the resulting number.

Now, let's work through each step:

Step 1: Identify the contribution of each place value
We are given the number of ones, tens, and hundreds as follows:

• Number of ones = 9, so this contributes $9 \times 1 = 9$.
• Number of tens = 2, so this contributes $2 \times 10 = 20$.
• Number of hundreds = 1, so this contributes $1 \times 100 = 100$.

Step 2: Sum these contributions to determine the resulting number
The total value is calculated by summing these contributions:
$(1 \times 100) + (2 \times 10) + (9 \times 1) = 100 + 20 + 9 = 129$.

Therefore, the number corresponding to the given place values is $129$.