Worksheet for practicing integer addition and subtraction with 20 problems.

Let's solve each problem step by step. The goal is to add and subtract integers, including positive and negative numbers.

We’ll go through each expression one at a time, applying the rules:

Rules for Adding and Subtracting Integers:

- Adding two positive numbers: Add normally.
- Adding two negative numbers: Add their absolute values and keep the negative sign.
- Adding a positive and a negative number: Subtract the smaller absolute value from the larger and use the sign of the larger.
- Subtracting a negative number: Turn it into addition (e.g., $ a - (-b) = a + b $).

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Let's solve each problem:

#### Left Column:
1. $ 15 - 7 = 8 $
2. $ 14 - 3 = 11 $
3. $ -15 - (-15) = -15 + 15 = 0 $
4. $ 15 - (-8) = 15 + 8 = 23 $
5. $ 10 - 9 = 1 $
6. $ 10 - (-5) = 10 + 5 = 15 $
7. $ 15 + (-12) = 15 - 12 = 3 $
8. $ 9 - (-5) = 9 + 5 = 14 $
9. $ -6 - (-15) = -6 + 15 = 9 $
10. $ -15 - 9 = -24 $
11. $ -15 - (-2) = -15 + 2 = -13 $
12. $ -14 + (-1) = -14 - 1 = -15 $
13. $ -14 + (-12) = -14 - 12 = -26 $

#### Right Column:
14. $ 10 - (-2) = 10 + 2 = 12 $
15. $ -2 + 14 = 12 $
16. $ 7 - 10 = -3 $
17. $ -12 - 15 = -27 $
18. $ -4 - (-10) = -4 + 10 = 6 $
19. $ 1 + 14 = 15 $
20. $ 5 - (-15) = 5 + 15 = 20 $
21. $ -12 + (-2) = -14 $
22. $ -8 + 13 = 5 $
23. $ 11 - (-3) = 11 + 3 = 14 $
24. $ -4 - 12 = -16 $
25. $ -14 + 5 = -9 $

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Final Answers:

Left Column:
1. 8
2. 11
3. 0
4. 23
5. 1
6. 15
7. 3
8. 14
9. 9
10. -24
11. -13
12. -15
13. -26

Right Column:
14. 12
15. 12
16. -3
17. -27
18. 6
19. 15
20. 20
21. -14
22. 5
23. 14
24. -16
25. -9

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✔ All answers are calculated correctly using integer rules.

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