Fill in the missing numbers in each number bond on this educational worksheet.

Problem Description:

The task involves filling in the missing numbers in each "number bond." A number bond is a visual representation of how numbers can be split into parts. The central number represents the total, and the two smaller circles represent the parts that add up to the total.

Solution Approach:

For each number bond:
1. Identify the total (the number in the central circle).
2. Identify one of the parts (one of the numbers in the smaller circles).
3. Calculate the missing part by subtracting the known part from the total.

Step-by-Step Solution:

#### Row 1:
1. Number Bond 1:
- Total: 10
- Known part: 8
- Missing part: \( 10 - 8 = 2 \)
- Fill in: 2

2. Number Bond 2:
- Total: 6
- Known part: 2
- Missing part: \( 6 - 2 = 4 \)
- Fill in: 4

3. Number Bond 3:
- Total: 4
- Known part: 2
- Missing part: \( 4 - 2 = 2 \)
- Fill in: 2

#### Row 2:
4. Number Bond 4:
- Total: 12
- Known part: 5
- Missing part: \( 12 - 5 = 7 \)
- Fill in: 7

5. Number Bond 5:
- Total: 9
- Known part: 4
- Missing part: \( 9 - 4 = 5 \)
- Fill in: 5

6. Number Bond 6:
- Total: 5
- Known part: 1
- Missing part: \( 5 - 1 = 4 \)
- Fill in: 4

#### Row 3:
7. Number Bond 7:
- Total: 8
- Known part: 6
- Missing part: \( 8 - 6 = 2 \)
- Fill in: 2

8. Number Bond 8:
- Total: 5
- Known part: 4
- Missing part: \( 5 - 4 = 1 \)
- Fill in: 1

9. Number Bond 9:
- Total: 9
- Known part: 5
- Missing part: \( 9 - 5 = 4 \)
- Fill in: 4

#### Row 4:
10. Number Bond 10:
- Total: 10
- Known part: 4
- Missing part: \( 10 - 4 = 6 \)
- Fill in: 6

11. Number Bond 11:
- Total: 7
- Known part: 2
- Missing part: \( 7 - 2 = 5 \)
- Fill in: 5

12. Number Bond 12:
- Total: 11
- Known part: 5
- Missing part: \( 11 - 5 = 6 \)
- Fill in: 6

Final Answer:

The completed number bonds are as follows:

| Total | Part 1 | Part 2 |
|-------|--------|--------|
| 10 | 8 | 2 |
| 6 | 4 | 2 |
| 4 | 2 | 2 |
| 12 | 5 | 7 |
| 9 | 4 | 5 |
| 5 | 4 | 1 |
| 8 | 6 | 2 |
| 5 | 4 | 1 |
| 9 | 4 | 5 |
| 10 | 4 | 6 |
| 7 | 2 | 5 |
| 11 | 6 | 5 |

\boxed{
\begin{array}{ccc}
10 & 8 & 2 \\
6 & 4 & 2 \\
4 & 2 & 2 \\
12 & 5 & 7 \\
9 & 4 & 5 \\
5 & 4 & 1 \\
8 & 6 & 2 \\
5 & 4 & 1 \\
9 & 4 & 5 \\
10 & 4 & 6 \\
7 & 2 & 5 \\
11 & 6 & 5 \\
\end{array}
}