Fill in the missing numbers 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 below the total that add up to it).

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

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Solution Approach:

For each number bond:
- If the total and one part are given, subtract the known part from the total to find the missing part.
- If two parts are given, add them together to find the total.

Let’s solve each number bond step by step.

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Step-by-Step Solution:

#### Row 1:
1. Number Bond 1:
- Total: 16
- Parts: 8, ?
- Missing part = 16 - 8 = 8

2. Number Bond 2:
- Total: 14
- Parts: ?, 12
- Missing part = 14 - 12 = 2

3. Number Bond 3:
- Total: ?
- Parts: 8, 12
- Total = 8 + 12 = 20

#### Row 2:
4. Number Bond 4:
- Total: 15
- Parts: ?, 5
- Missing part = 15 - 5 = 10

5. Number Bond 5:
- Total: ?
- Parts: 10, 10
- Total = 10 + 10 = 20

6. Number Bond 6:
- Total: 13
- Parts: ?, 8
- Missing part = 13 - 8 = 5

#### Row 3:
7. Number Bond 7:
- Total: 15
- Parts: 7, ?
- Missing part = 15 - 7 = 8

8. Number Bond 8:
- Total: ?
- Parts: 15, 3
- Total = 15 + 3 = 18

9. Number Bond 9:
- Total: 16
- Parts: ?, 11
- Missing part = 16 - 11 = 5

#### Row 4:
10. Number Bond 10:
- Total: 18
- Parts: 10, ?
- Missing part = 18 - 10 = 8

11. Number Bond 11:
- Total: 12
- Parts: 6, ?
- Missing part = 12 - 6 = 6

12. Number Bond 12:
- Total: ?
- Parts: 14, 6
- Total = 14 + 6 = 20

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Final Answer:

Filling in the missing numbers, the completed number bonds are:

| 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 |

Thus, the final answer is:

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