Place value worksheet for students to practice breaking down three-digit numbers into hundreds, tens, and ones.

Problem Explanation:

The task requires breaking down each given number into its place values (hundreds, tens, and ones) and then writing the expanded form of the number. The expanded form shows the value of each digit in the number.

Steps to Solve:

1. Identify the Place Values:
- For any three-digit number \( ABC \):
- \( A \) is the hundreds place.
- \( B \) is the tens place.
- \( C \) is the ones place.
- Write the number of hundreds, tens, and ones for each given number.

2. Write the Expanded Form:
- The expanded form is written as:
\[
(\text{Hundreds} \times 100) + (\text{Tens} \times 10) + (\text{Ones} \times 1)
\]
- For example, for the number 421:
- Hundreds: 4
- Tens: 2
- Ones: 1
- Expanded form: \( 400 + 20 + 1 \)

3. Repeat for Each Number:
- Apply the same process to all the numbers listed in the table.

Solution:

#### Number: 421
- Hundreds: 4
- Tens: 2
- Ones: 1
- Expanded Form: \( 400 + 20 + 1 = 421 \)

#### Number: 809
- Hundreds: 8
- Tens: 0
- Ones: 9
- Expanded Form: \( 800 + 0 + 9 = 809 \)

#### Number: 437
- Hundreds: 4
- Tens: 3
- Ones: 7
- Expanded Form: \( 400 + 30 + 7 = 437 \)

#### Number: 296
- Hundreds: 2
- Tens: 9
- Ones: 6
- Expanded Form: \( 200 + 90 + 6 = 296 \)

#### Number: 673
- Hundreds: 6
- Tens: 7
- Ones: 3
- Expanded Form: \( 600 + 70 + 3 = 673 \)

#### Number: 451
- Hundreds: 4
- Tens: 5
- Ones: 1
- Expanded Form: \( 400 + 50 + 1 = 451 \)

Final Answer:

\[
\boxed{
\begin{array}{|c|c|c|}
\hline
\text{Number} & \text{Hundreds, Tens and Ones} & \text{Expanded Form} \\
\hline
421 & 4 \text{ hundreds}, 2 \text{ tens}, 1 \text{ ones} & 400 + 20 + 1 = 421 \\
\hline
809 & 8 \text{ hundreds}, 0 \text{ tens}, 9 \text{ ones} & 800 + 0 + 9 = 809 \\
\hline
437 & 4 \text{ hundreds}, 3 \text{ tens}, 7 \text{ ones} & 400 + 30 + 7 = 437 \\
\hline
296 & 2 \text{ hundreds}, 9 \text{ tens}, 6 \text{ ones} & 200 + 90 + 6 = 296 \\
\hline
673 & 6 \text{ hundreds}, 7 \text{ tens}, 3 \text{ ones} & 600 + 70 + 3 = 673 \\
\hline
451 & 4 \text{ hundreds}, 5 \text{ tens}, 1 \text{ ones} & 400 + 50 + 1 = 451 \\
\hline
\end{array}
}
\]