Worksheet for practicing addition and subtraction of integers with various problems.

Let's solve the Adding and Subtracting Integers (A) worksheet step by step. I'll go through each problem, show the calculation, and provide the final answer.

---

Rules to Remember:

- Adding a negative number is like subtracting:
$ a + (-b) = a - b $
- Subtracting a negative number is like adding:
$ a - (-b) = a + b $
- When adding or subtracting integers, pay attention to signs.

---

Solutions:

#### Column 1:

1. $-9 + 9 = 0$
2. $-7 + 8 = 1$
3. $-8 + (-7) = -15$
4. $-10 - (-4) = -10 + 4 = -6$
5. $-9 - (-10) = -9 + 10 = 1$
6. $-7 - 9 = -16$
7. $8 + (-3) = 5$
8. $-4 + 8 = 4$
9. $2 + 7 = 9$
10. $10 + (-10) = 0$
11. $-7 - (-2) = -7 + 2 = -5$
12. $-9 - (-7) = -9 + 7 = -2$
13. $1 + 10 = 11$
14. $5 + 9 = 14$
15. $-5 - 10 = -15$
16. $-2 - 9 = -11$
17. $10 - (-3) = 10 + 3 = 13$
18. $-8 - 9 = -17$
19. $10 + (-9) = 1$
20. $-5 - (-8) = -5 + 8 = 3$
21. $-3 - (-1) = -3 + 1 = -2$
22. $1 - 9 = -8$
23. $6 - (-3) = 6 + 3 = 9$
24. $-8 - 10 = -18$
25. $-6 + (-10) = -16$

---

#### Column 2:

1. $-8 + (-1) = -9$
2. $-5 - 4 = -9$
3. $7 + 10 = 17$
4. $-9 + (-3) = -12$
5. $9 - (-8) = 9 + 8 = 17$
6. $10 + 7 = 17$
7. $6 + 7 = 13$
8. $-3 + (-4) = -7$
9. $-4 - (-3) = -4 + 3 = -1$
10. $-7 - 4 = -11$
11. $10 - 1 = 9$
12. $1 - 5 = -4$
13. $-7 + (-1) = -8$
14. $8 - (-5) = 8 + 5 = 13$
15. $-4 - (-6) = -4 + 6 = 2$
16. $-7 - (-3) = -7 + 3 = -4$
17. $9 - (-1) = 9 + 1 = 10$
18. $-4 + 7 = 3$
19. $3 + 3 = 6$
20. $8 + 8 = 16$
21. $5 - 6 = -1$
22. $1 - 8 = -7$
23. $9 + 5 = 14$
24. $-6 + (-6) = -12$
25. $-8 + (-2) = -10$

---

#### Column 3:

1. $-2 + (-1) = -3$
2. $4 - 9 = -5$
3. $-8 - 6 = -14$
4. $-6 + (-9) = -15$
5. $-9 - 4 = -13$
6. $-1 - (-7) = -1 + 7 = 6$
7. $-4 - 10 = -14$
8. $-1 + (-1) = -2$
9. $3 + (-10) = -7$
10. $-6 - (-2) = -6 + 2 = -4$
11. $10 + (-8) = 2$
12. $5 + 2 = 7$
13. $2 + 8 = 10$
14. $10 - 5 = 5$
15. $3 + (-2) = 1$
16. $1 - 2 = -1$
17. $1 - 4 = -3$
18. $-4 + 1 = -3$
19. $2 - (-10) = 2 + 10 = 12$
20. $5 + (-3) = 2$
21. $6 + (-1) = 5$
22. $3 + 8 = 11$
23. $3 + 9 = 12$
24. $-9 - 2 = -11$
25. $8 + 4 = 12$

---

✔ Final Answers:

#### Column 1:
0, 1, -15, -6, 1, -16, 5, 4, 9, 0, -5, -2, 11, 14, -15, -11, 13, -17, 1, 3, -2, -8, 9, -18, -16

#### Column 2:
-9, -9, 17, -12, 17, 17, 13, -7, -1, -11, 9, -4, -8, 13, 2, -4, 10, 3, 6, 16, -1, -7, 14, -12, -10

#### Column 3:
-3, -5, -14, -15, -13, 6, -14, -2, -7, -4, 2, 7, 10, 5, 1, -1, -3, -3, 12, 2, 5, 11, 12, -11, 12

---

Let me know if you'd like this formatted as a printable answer key!