Let's go through the problems and solve them step by step. The image contains a series of basic arithmetic problems involving addition and subtraction of integers. Here are the solutions:

1. 8 + (−1) = 7
2. 3 + (−3) = 0
3. 6 + 4 = 10
4. 6 + (−3) = 3
5. (−1) + (−6) = −7
6. (−8) + 5 = −3
7. (−5) + (−3) = −8
8. (−3) + (−3) = −6
9. (−1) + (−6) = −7
10. 5 + (−4) = 1
11. 7 + 5 + (−2) = 10
12. 3 + (−8) + 6 = 1
13. 6 + 4 + (−8) = 2
14. 8 + 3 + (−4) = 7
15. (−1) + (−4) + (−4) = −9
16. (−1) + (−4) + (−4) = −9
17. (−1) + (−1) + (−1) = −3
18. 5 + 1 + (−2) = 4
19. 2 + (−2) + 5 = 5
20. (−5) + (−5) + 7 = −3

Would you like more details on any of these steps? Here are some questions to extend your understanding:

1. What is the rule for adding two negative integers?
2. How do you determine the sign of the result when adding a positive and negative number?
3. What happens when you add zero to any number?
4. How can you simplify expressions with multiple terms, such as problem 11?
5. Why does subtracting a negative number turn into addition?

Tip: When adding integers, think of negative numbers as moving left on a number line and positive numbers as moving right!