Fill in the missing numbers to complete the number bonds to 9.

Problem Description:

The task involves filling in the missing numbers in a series of "number bonds" to 9. A number bond is a visual representation that shows how numbers can be split into parts. In this case, each number bond consists of three numbers: a total (which is always 9) and two parts that add up to the total.

Solution Approach:

For each number bond, we need to determine the missing part such that the sum of the two parts equals 9. This can be done using simple subtraction:
- If one part is given, subtract it from 9 to find the other part.
- If both parts are missing, use logical reasoning or trial and error to ensure their sum is 9.

Step-by-Step Solution:

#### Row 1:
1. \( 9 = 8 + \boxed{1} \)
2. \( 9 = 7 + \boxed{2} \)
3. \( 9 = 8 + \boxed{1} \)
4. \( 9 = 7 + \boxed{2} \)
5. \( 9 = 9 + \boxed{0} \)

#### Row 2:
6. \( 9 = \boxed{3} + 6 \)
7. \( 9 = \boxed{2} + 7 \)
8. \( 9 = \boxed{3} + 6 \)
9. \( 9 = \boxed{4} + 5 \)
10. \( 9 = \boxed{5} + 4 \)

#### Row 3:
11. \( 9 = 8 + \boxed{1} \)
12. \( 9 = \boxed{8} + 1 \)
13. \( 9 = 7 + \boxed{2} \)
14. \( 9 = 2 + \boxed{7} \)
15. \( 9 = 6 + \boxed{3} \)

#### Row 4:
16. \( 9 = \boxed{4} + 5 \)
17. \( 9 = \boxed{3} + 6 \)
18. \( 9 = \boxed{2} + 7 \)
19. \( 9 = 2 + \boxed{7} \)
20. \( 9 = \boxed{6} + 3 \)

#### Row 5:
21. \( 9 = 5 + \boxed{4} \)
22. \( 9 = 1 + \boxed{8} \)
23. \( 9 = 2 + \boxed{7} \)
24. \( 9 = 0 + \boxed{9} \)
25. \( 9 = 2 + \boxed{7} \)

Final Answer:

\[
\boxed{
\begin{array}{ccccc}
1 & 2 & 3 & 4 & 5 \\
8+1 & 7+2 & 8+1 & 7+2 & 9+0 \\
6 & 7 & 8 & 9 & 10 \\
3+6 & 2+7 & 3+6 & 4+5 & 5+4 \\
11 & 12 & 13 & 14 & 15 \\
8+1 & 8+1 & 7+2 & 2+7 & 6+3 \\
16 & 17 & 18 & 19 & 20 \\
4+5 & 3+6 & 2+7 & 2+7 & 6+3 \\
21 & 22 & 23 & 24 & 25 \\
5+4 & 1+8 & 2+7 & 0+9 & 2+7 \\
\end{array}
}
\]