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Here are the solutions to fill in the blanks for each problem.

Column 1:
* $22 + \mathbf{8} = 30$
* $83 + \mathbf{7} = 90$
* $49 + \mathbf{1} = 50$
* $1 + \mathbf{9} = 10$
* $69 + \mathbf{1} = 70$
* $67 + \mathbf{3} = 70$
* $13 + \mathbf{7} = 20$
* $94 + \mathbf{6} = 100$
* $79 + \mathbf{1} = 80$
* $78 + \mathbf{2} = 80$
* $58 + \mathbf{2} = 60$
* $26 + \mathbf{4} = 30$
* $75 + \mathbf{5} = 80$
* $44 + \mathbf{6} = 50$
* $6 + \mathbf{4} = 10$
* $45 + \mathbf{5} = 50$
* $73 + \mathbf{7} = 80$
* $39 + \mathbf{1} = 40$
* $11 + \mathbf{9} = 20$
* $71 + \mathbf{9} = 80$
* $76 + \mathbf{4} = 80$
* $7 + \mathbf{3} = 10$
* $19 + \mathbf{1} = 20$
* $89 + \mathbf{1} = 90$
* $55 + \mathbf{5} = 60$

Column 2:
* $92 + \mathbf{8} = 100$
* $24 + \mathbf{6} = 30$
* $74 + \mathbf{6} = 80$
* $35 + \mathbf{5} = 40$
* $27 + \mathbf{3} = 30$
* $99 + \mathbf{1} = 100$
* $86 + \mathbf{4} = 90$
* $96 + \mathbf{4} = 100$
* $97 + \mathbf{3} = 100$
* $16 + \mathbf{4} = 20$
* $62 + \mathbf{8} = 70$
* $48 + \mathbf{2} = 50$
* $4 + \mathbf{6} = 10$
* $54 + \mathbf{6} = 60$
* $84 + \mathbf{6} = 90$
* $87 + \mathbf{3} = 90$
* $52 + \mathbf{8} = 60$
* $72 + \mathbf{8} = 80$
* $23 + \mathbf{7} = 30$
* $43 + \mathbf{7} = 50$
* $82 + \mathbf{8} = 90$
* $3 + \mathbf{7} = 10$
* $36 + \mathbf{4} = 40$
* $95 + \mathbf{5} = 100$
* $68 + \mathbf{2} = 70$

Column 3:
* $\mathbf{5} + 95 = 100$
* $\mathbf{31} + 59 = 90$
* $\mathbf{9} + 11 = 20$
* $\mathbf{4} + 96 = 100$
* $\mathbf{18} + 2 = 20$
* $\mathbf{1} + 19 = 20$
* $\mathbf{2} + 58 = 60$
* $\mathbf{9} + 51 = 60$
* $\mathbf{2} + 28 = 30$
* $\mathbf{6} + 24 = 30$
* $\mathbf{4} + 64 = 70$
* $\mathbf{6} + 44 = 50$
* $\mathbf{8} + 32 = 40$
* $\mathbf{1} + 9 = 10$
* $\mathbf{3} + 77 = 80$
* $\mathbf{23} + 26 = 50$ (Note: The sum is 49, so likely a typo in worksheet or answer is 23 rounding up, but strictly math is $49+1=50$. Assuming standard addition: $23+26=49$. If target is 50, missing number is 24. Let's re-read carefully. Ah, it says `__ + 26 = 50`. So $50 - 26 = 24$. Correct answer is 24.) -> Correction: $\mathbf{24} + 26 = 50$
* $\mathbf{4} + 6 = 10$
* $\mathbf{6} + 14 = 20$
* $\mathbf{2} + 78 = 80$
* $\mathbf{4} + 36 = 40$
* $\mathbf{5} + 85 = 90$
* $\mathbf{13} + 13 = 26$? No, looking at pattern `__ + 13 = 20`. Answer is 7.
* $\mathbf{5} + 35 = 40$
* $\mathbf{4} + 76 = 80$
* $\mathbf{6} + 34 = 40$

Let me re-verify Column 3 row by row carefully.
1. `__ + 95 = 100` -> 5
2. `__ + 59 = 90` -> 31
3. `__ + 11 = 20` -> 9
4. `__ + 96 = 100` -> 4
5. `__ + 2 = 20` -> 18
6. `__ + 19 = 20` -> 1
7. `__ + 58 = 60` -> 2
8. `__ + 51 = 60` -> 9
9. `__ + 28 = 30` -> 2
10. `__ + 24 = 30` -> 6
11. `__ + 64 = 70` -> 6
12. `__ + 44 = 50` -> 6
13. `__ + 32 = 40` -> 8
14. `__ + 9 = 10` -> 1
15. `__ + 77 = 80` -> 3
16. `__ + 26 = 50` -> 24
17. `__ + 6 = 10` -> 4
18. `__ + 14 = 20` -> 6
19. `__ + 78 = 80` -> 2
20. `__ + 36 = 40` -> 4
21. `__ + 85 = 90` -> 5
22. `__ + 13 = 20` -> 7
23. `__ + 35 = 40` -> 5
24. `__ + 76 = 80` -> 4
25. `__ + 34 = 40` -> 6

Column 4:
* $\mathbf{1} + 29 = 30$
* $\mathbf{7} + 83 = 90$
* $\mathbf{1} + 39 = 40$
* $\mathbf{9} + 61 = 70$
* $\mathbf{6} + 94 = 100$
* $\mathbf{2} + 98 = 100$
* $\mathbf{3} + 37 = 40$
* $\mathbf{3} + 27 = 30$
* $\mathbf{6} + 74 = 80$
* $\mathbf{3} + 15 = 20$
* $\mathbf{9} + 41 = 50$
* $\mathbf{3} + 7 = 10$
* $\mathbf{7} + 93 = 100$
* $\mathbf{8} + 42 = 50$
* $\mathbf{1} + 89 = 90$
* $\mathbf{3} + 17 = 20$
* $\mathbf{5} + 55 = 60$
* $\mathbf{8} + 72 = 80$
* $\mathbf{5} + 25 = 30$
* $\mathbf{9} + 91 = 100$
* $\mathbf{6} + 84 = 90$
* $\mathbf{8} + 82 = 90$
* $\mathbf{3} + 97 = 100$
* $\mathbf{2} + 8 = 10$
* $\mathbf{9} + 21 = 30$

Final Answer:
Column 1: 8, 7, 1, 9, 1, 3, 7, 6, 1, 2, 2, 4, 5, 6, 4, 5, 7, 1, 9, 9, 4, 3, 1, 1, 5
Column 2: 8, 6, 6, 5, 3, 1, 4, 4, 3, 4, 8, 2, 6, 6, 6, 3, 8, 8, 7, 7, 8, 7, 4, 5, 2
Column 3: 5, 31, 9, 4, 18, 1, 2, 9, 2, 6, 6, 6, 8, 1, 3, 24, 4, 6, 2, 4, 5, 7, 5, 4, 6
Column 4: 1, 7, 1, 9, 6, 2, 3, 3, 6, 3, 9, 3, 7, 8, 1, 3, 5, 8, 5, 9, 6, 8, 3, 2, 9