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

Problem Explanation:

The task involves solving number bonds, which are pairs of numbers that add up to a given total. Each number bond consists of three parts:
1. A total (the sum at the top).
2. Two parts (the numbers on the sides or bottom that add up to the total).

We need to fill in the missing numbers in each number bond.

---

Solution Approach:

For each number bond, we use the relationship:
\[
\text{Total} = \text{Part 1} + \text{Part 2}
\]
If one part is missing, we can find it using:
\[
\text{Missing Part} = \text{Total} - \text{Known Part}
\]

Let's solve each number bond step by step.

---

Step-by-Step Solution:

#### Row 1:
1. Number Bond 1:
- Total: 16
- Parts: 8 and ?
- Missing part: \( 16 - 8 = 8 \)
- Filled: \( 16 = 8 + 8 \)

2. Number Bond 2:
- Total: 14
- Parts: ? and 12
- Missing part: \( 14 - 12 = 2 \)
- Filled: \( 14 = 2 + 12 \)

3. Number Bond 3:
- Total: ?
- Parts: 8 and 12
- Missing total: \( 8 + 12 = 20 \)
- Filled: \( 20 = 8 + 12 \)

#### Row 2:
4. Number Bond 4:
- Total: 15
- Parts: ? and 5
- Missing part: \( 15 - 5 = 10 \)
- Filled: \( 15 = 10 + 5 \)

5. Number Bond 5:
- Total: ?
- Parts: 10 and 10
- Missing total: \( 10 + 10 = 20 \)
- Filled: \( 20 = 10 + 10 \)

6. Number Bond 6:
- Total: 13
- Parts: ? and 8
- Missing part: \( 13 - 8 = 5 \)
- Filled: \( 13 = 5 + 8 \)

#### Row 3:
7. Number Bond 7:
- Total: 15
- Parts: 7 and ?
- Missing part: \( 15 - 7 = 8 \)
- Filled: \( 15 = 7 + 8 \)

8. Number Bond 8:
- Total: ?
- Parts: 15 and 3
- Missing total: \( 15 + 3 = 18 \)
- Filled: \( 18 = 15 + 3 \)

9. Number Bond 9:
- Total: 16
- Parts: ? and 11
- Missing part: \( 16 - 11 = 5 \)
- Filled: \( 16 = 5 + 11 \)

#### Row 4:
10. Number Bond 10:
- Total: 18
- Parts: 10 and ?
- Missing part: \( 18 - 10 = 8 \)
- Filled: \( 18 = 10 + 8 \)

11. Number Bond 11:
- Total: 12
- Parts: 6 and ?
- Missing part: \( 12 - 6 = 6 \)
- Filled: \( 12 = 6 + 6 \)

12. Number Bond 12:
- Total: ?
- Parts: 14 and 6
- Missing total: \( 14 + 6 = 20 \)
- Filled: \( 20 = 14 + 6 \)

---

Final Answer:

Here are the completed number bonds:

| Total | Part 1 | Part 2 |
|-------|--------|--------|
| 16 | 8 | 8 |
| 14 | 2 | 12 |
| 20 | 8 | 12 |
| 15 | 10 | 5 |
| 20 | 10 | 10 |
| 13 | 5 | 8 |
| 15 | 7 | 8 |
| 18 | 15 | 3 |
| 16 | 5 | 11 |
| 18 | 10 | 8 |
| 12 | 6 | 6 |
| 20 | 14 | 6 |

\boxed{
\begin{array}{ccc}
16 & 8 & 8 \\
14 & 2 & 12 \\
20 & 8 & 12 \\
15 & 10 & 5 \\
20 & 10 & 10 \\
13 & 5 & 8 \\
15 & 7 & 8 \\
18 & 15 & 3 \\
16 & 5 & 11 \\
18 & 10 & 8 \\
12 & 6 & 6 \\
20 & 14 & 6 \\
\end{array}
}