Answer Key — Scientific Notation Worksheet

A. Write in Scientific Notation

1. 5 × 10³
2. 8 × 10³
3. 1.2 × 10⁴
4. 4.5 × 10⁴
5. 7.2 × 10⁴
6. 3 × 10⁵
7. 6.5 × 10⁵
8. 1.2 × 10⁶
9. 4.5 × 10⁶
10. 9.8 × 10⁶
11. 5.6 × 10⁷
12. 1.25 × 10⁸
13. 7 × 10⁸
14. 3.4 × 10⁹
15. 8.9 × 10⁹

B. Small Numbers in Scientific Notation

16. 5 × 10⁻¹
17. 8 × 10⁻²
18. 6 × 10⁻³
19. 4.5 × 10⁻³
20. 7.2 × 10⁻⁴
21. 9 × 10⁻⁵
22. 6 × 10⁻⁶
23. 3.5 × 10⁻⁶
24. 8.1 × 10⁻⁷
25. 4.5 × 10⁻⁸

C. Scientific Notation to Standard Form

26. 300
27. 7,000
28. 45,000
29. 620,000
30. 8,000,000
31. 25,000,000
32. 910,000,000
33. 1,200,000,000
34. 0.05
35. 0.007
36. 0.00048
37. 0.000065
38. 0.000003
39. 0.00000082
40. 0.000000094

D. Missing Exponent

41. 3
42. 4
43. 5
44. 6
45. −2
46. −3
47. −4
48. −5
49. 3
50. −4

E. Choose the Correct Answer

51. a) 2.5 × 10⁴
52. b) 6 × 10⁵
53. b) 4,000
54. b) 720,000
55. b) 6 × 10⁻⁴
56. b) 0.0035
57. b) 4.5 × 10³
58. a) 9 × 10⁶
59. c) 0.00081
60. b) 3 × 10⁵

F. True or False

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

G. Challenge Questions

69. 4.56 × 10⁴
70. 5.6 × 10⁻⁵
71. 78,900,000
72. 0.0000234
73. 3.5 × 10⁸
74. 9.2 × 10⁻⁷
75. 5.2 × 10⁶