Fill in the missing numbers in the number bonds using addition and subtraction.

To solve the problem, we need to use addition and subtraction to fill in the missing numbers in each number bond. A number bond is a visual representation of how numbers can be split into parts or combined to form a whole. Here's how we can approach each part:

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General Approach:

1. Identify the total (top number): This is the sum of the two parts below it.
2. Use addition or subtraction:
- If one part is missing, subtract the known part from the total.
- If the total is missing, add the two parts together.

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Solutions:

#### a.
- Total: 17
- Parts: 9 and ?
- Missing part = Total - Known part = 17 - 9 = 8

#### b.
- Total: ?
- Parts: 4 and 3
- Total = Part 1 + Part 2 = 4 + 3 = 7

#### c.
- Total: ?
- Parts: 4 and 9
- Total = Part 1 + Part 2 = 4 + 9 = 13

#### d.
- Total: 18
- Parts: 9 and ?
- Missing part = Total - Known part = 18 - 9 = 9

#### e.
- Total: 12
- Parts: 11 and ?
- Missing part = Total - Known part = 12 - 11 = 1

#### f.
- Total: 11
- Parts: 3 and ?
- Missing part = Total - Known part = 11 - 3 = 8

#### g.
- Total: ?
- Parts: 7 and 9
- Total = Part 1 + Part 2 = 7 + 9 = 16

#### h.
- Total: 14
- Parts: 8 and ?
- Missing part = Total - Known part = 14 - 8 = 6

#### i.
- Total: ?
- Parts: 7 and 8
- Total = Part 1 + Part 2 = 7 + 8 = 15

#### j.
- Total: 10
- Parts: 1 and ?
- Missing part = Total - Known part = 10 - 1 = 9

#### k.
- Total: ?
- Parts: 1 and 1
- Total = Part 1 + Part 2 = 1 + 1 = 2

#### l.
- Total: 11
- Parts: 5 and ?
- Missing part = Total - Known part = 11 - 5 = 6

#### m.
- Total: ?
- Parts: 7 and 6
- Total = Part 1 + Part 2 = 7 + 6 = 13

#### n.
- Total: ?
- Parts: 4 and 2
- Total = Part 1 + Part 2 = 4 + 2 = 6

#### o.
- Total: 14
- Parts: 7 and ?
- Missing part = Total - Known part = 14 - 7 = 7

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Final Answers:

- a. 8
- b. 7
- c. 13
- d. 9
- e. 1
- f. 8
- g. 16
- h. 6
- i. 15
- j. 9
- k. 2
- l. 6
- m. 13
- n. 6
- o. 7

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Boxed Final Answer:

\[
\boxed{8, 7, 13, 9, 1, 8, 16, 6, 15, 9, 2, 6, 13, 6, 7}
\]