Practice addition facts to 10 using bar models to find missing numbers.

Problem Description:

The task involves filling in the missing numbers in bar models to complete addition facts that sum to 10. Each bar model represents a part-whole relationship where the total is 10, and we need to determine the missing parts.

Solution Approach:

For each bar model:
1. Identify the total (which is always 10).
2. Identify the given part.
3. Use the equation:
\[
\text{Total} = \text{Part 1} + \text{Part 2}
\]
Rearrange to find the missing part:
\[
\text{Missing Part} = \text{Total} - \text{Given Part}
\]

Step-by-Step Solution:

#### 1.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
& 2 \\
\hline
\end{array}
\]
- Total = 10
- Given part = 2
- Missing part = \( 10 - 2 = 8 \)
\[
\boxed{8}
\]

#### 2.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
5 & \\
\hline
\end{array}
\]
- Total = 10
- Given part = 5
- Missing part = \( 10 - 5 = 5 \)
\[
\boxed{5}
\]

#### 3.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
1 & \\
\hline
\end{array}
\]
- Total = 10
- Given part = 1
- Missing part = \( 10 - 1 = 9 \)
\[
\boxed{9}
\]

#### 4.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
& 3 \\
\hline
\end{array}
\]
- Total = 10
- Given part = 3
- Missing part = \( 10 - 3 = 7 \)
\[
\boxed{7}
\]

#### 5.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
6 & \\
\hline
\end{array}
\]
- Total = 10
- Given part = 6
- Missing part = \( 10 - 6 = 4 \)
\[
\boxed{4}
\]

#### 6.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
& 5 \\
\hline
\end{array}
\]
- Total = 10
- Given part = 5
- Missing part = \( 10 - 5 = 5 \)
\[
\boxed{5}
\]

#### 7.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
& 7 \\
\hline
\end{array}
\]
- Total = 10
- Given part = 7
- Missing part = \( 10 - 7 = 3 \)
\[
\boxed{3}
\]

#### 8.
\[
\begin{array}{|c|c|c|}
\hline
10 & & \\
\hline
& 9 & \\
\hline
\end{array}
\]
- Total = 10
- Given part = 9
- Missing part = \( 10 - 9 = 1 \)
\[
\boxed{1}
\]

#### 9.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
& 8 \\
\hline
\end{array}
\]
- Total = 10
- Given part = 8
- Missing part = \( 10 - 8 = 2 \)
\[
\boxed{2}
\]

#### 10.
\[
\begin{array}{|c|c|}
\hline
10 & \\
\hline
4 & \\
\hline
\end{array}
\]
- Total = 10
- Given part = 4
- Missing part = \( 10 - 4 = 6 \)
\[
\boxed{6}
\]

Final Answer:

\[
\boxed{8, 5, 9, 7, 4, 5, 3, 1, 2, 6}
\]