Adding Integers Worksheet

Name: ____________________________
Class: ____________________________
Date: ____________________________

Quick Review

When adding integers:

• Same signs: Add the numbers and keep the same sign.
• Different signs: Subtract the smaller absolute value from the larger and keep the sign of the number with the greater absolute value.

Examples:

• 5 + 3 = 8
• −5 + (−3) = −8
• 8 + (−3) = 5
• −8 + 3 = −5

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A. Add the Integers

1. 5 + 3 = ______
2. 7 + 2 = ______
3. 9 + 4 = ______
4. 6 + 8 = ______
5. 12 + 5 = ______
6. 15 + 7 = ______
7. 20 + 9 = ______
8. 18 + 6 = ______
9. 25 + 12 = ______
10. 30 + 15 = ______

B. Add Negative Integers

11. −5 + (−3) = ______
12. −7 + (−2) = ______
13. −9 + (−4) = ______
14. −6 + (−8) = ______
15. −12 + (−5) = ______
16. −15 + (−7) = ______
17. −20 + (−9) = ______
18. −18 + (−6) = ______
19. −25 + (−12) = ______
20. −30 + (−15) = ______

C. Add Integers with Different Signs

21. 8 + (−3) = ______
22. 10 + (−6) = ______
23. 15 + (−7) = ______
24. 20 + (−9) = ______
25. 18 + (−12) = ______
26. 25 + (−15) = ______
27. 30 + (−18) = ______
28. 14 + (−20) = ______
29. 12 + (−17) = ______
30. 9 + (−14) = ______

D. Negative Plus Positive

31. −8 + 3 = ______
32. −10 + 6 = ______
33. −15 + 7 = ______
34. −20 + 9 = ______
35. −18 + 12 = ______
36. −25 + 15 = ______
37. −30 + 18 = ______
38. −14 + 20 = ______
39. −12 + 17 = ______
40. −9 + 14 = ______

E. Find the Missing Integer

41. 5 + ______ = 12
42. 8 + ______ = 15
43. 10 + ______ = 4
44. −5 + ______ = −12
45. −8 + ______ = −15
46. −10 + ______ = −4
47. 12 + ______ = 20
48. −12 + ______ = −20
49. 15 + ______ = 5
50. −15 + ______ = −5

F. Choose the Correct Answer

51. 7 + (−4) =
    a) 3
    b) −3
    c) 11
52. −6 + (−5) =
    a) 11
    b) −11
    c) −1
53. −10 + 7 =
    a) 3
    b) −3
    c) −17
54. 12 + (−8) =
    a) 4
    b) −4
    c) 20
55. −15 + (−10) =
    a) 25
    b) −25
    c) −5
56. 20 + (−25) =
    a) 5
    b) −5
    c) 45
57. −18 + 12 =
    a) 6
    b) −6
    c) −30
58. 30 + (−12) =
    a) 18
    b) −18
    c) 42
59. −25 + 15 =
    a) 10
    b) −10
    c) −40
60. −9 + 14 =
    a) −5
    b) 5
    c) 23

G. True or False

61. 5 + 4 = 9. __________
62. −5 + (−4) = −9. __________
63. 10 + (−6) = 16. __________
64. −10 + 6 = −4. __________
65. 15 + (−15) = 0. __________
66. −8 + 3 = −5. __________
67. −12 + (−8) = −20. __________
68. 20 + (−7) = 13. __________
69. −20 + 7 = −13. __________
70. Adding two negative integers always gives a positive answer. __________

H. Challenge Questions

71. −15 + 8 + 4 = ______
72. 20 + (−7) + (−5) = ______
73. −12 + (−8) + 15 = ______
74. 25 + (−10) + (−8) = ______
75. −30 + 12 + 9 = ______
76. 18 + (−25) + 10 = ______
77. −20 + (−15) + 25 = ______
78. 40 + (−18) + (−12) = ______
79. −35 + 20 + 8 = ______
80. 50 + (−30) + (−15) = ______

Total Questions: 80

Answer Key — Adding Integers Worksheet

A. Add the Integers

1. 8
2. 9
3. 13
4. 14
5. 17
6. 22
7. 29
8. 24
9. 37
10. 45

B. Add Negative Integers

11. −8
12. −9
13. −13
14. −14
15. −17
16. −22
17. −29
18. −24
19. −37
20. −45

C. Different Signs

21. 5
22. 4
23. 8
24. 11
25. 6
26. 10
27. 12
28. −6
29. −5
30. −5

D. Negative Plus Positive

31. −5
32. −4
33. −8
34. −11
35. −6
36. −10
37. −12
38. 6
39. 5
40. 5

E. Missing Integer

41. 7
42. 7
43. −6
44. −7
45. −7
46. 6
47. 8
48. −8
49. −10
50. 10

F. Multiple Choice

51. a) 3
52. b) −11
53. b) −3
54. a) 4
55. b) −25
56. b) −5
57. b) −6
58. a) 18
59. b) −10
60. b) 5

G. True or False

61. True
62. True
63. False
64. True
65. True
66. True
67. True
68. True
69. True
70. False

H. Challenge Questions

71. −3
72. 8
73. −5
74. 7
75. −3
76. 3
77. −10
78. 10
79. −7
80. 5