APPENDIX
B

Answer Key

This appendix includes the answers to the practice problems in Appendix A. Check your work and see how you’ve progressed!

Chapter 1: Multiplication

1. 48
2. 49
3. 54
4. 90
5. 42
6. 28,710
7. 56,012
8. 38,225
9. 7,859
10. 101,761
11. 72
12. 48
13. 63
14. 32
15. 56
16. 9,310
17. 8,455
18. 8,004
19. 8,740
20. 8,624
21. 987,030
22. 978,096
23. 975,156
24. 995,006
25. 987,042
26. 266
27. 168
28. 323
29. 228
30. 143
31. 12,257
32. 12,296
33. 13,688
34. 12,656
35. 12,430
36. 1,016,063
37. 1,019,048
38. 1,033,270
39. 1,014,024
40. 1,020,036
41. 99
42. 120
43. 96
44. 91
45. 108
46. 9,898
47. 9,240
48. 10,767
49. 10,152
50. 10,752
51. 996,996
52. 995,904
53. 977,637
54. 1,011,987
55. 1,048,898
56. 3,024
57. 43,860
58. 88,504
59. 91,805
60. 4,355
61. 41,778
62. 2,632
63. 10,058
64. 244,989
65. 89,711
66. 4,268
67. 1,120
68. 3,698
69. 1,405
70. 594
71. 394,221
72. 134,696
73. 764,400
74. 209,214
75. 479,516

Chapter 2: Addition

1. 150
2. 157
3. 170
4. 148
5. 136
6. 1,164
7. 909
8. 1,059
9. 1,206
10. 1,369
11. 20,790
12. 19,510
13. 21,631
14. 19,725
15. 12,135
16. 63
17. 70
18. 76
19. 74
20. 84
21. 8,561
22. 14,004
23. 11,821
24. 9,193
25. 14,196

Chapter 3: Subtraction

1. 283
2. 35
3. 180
4. 439
5. 285
6. 37
7. 14
8. 41
9. 14
10. 42
11. 4,134
12. 6,702
13. 2,775
14. 2,076
15. 1,458
16. 8,983
17. 4,313
18. 66,853
19. 53,378
20. 70,943

Chapter 4: Division

1. 53.813
2. 202.68
3. 215.464
4. 49.989
5. 77.493
6. 101.845
7. 225.986
8. 474.411
9. 60.327
10. 81.980
11. 91.873
12. 93.364
13. 261.004
14. 121.459
15. 181.894
16. 0.0526
17. 0.0588
18. 0.4137
19. 0.020408
20. 0.01694

Chapter 5: Checking Your Answers with Digit Sums

1. True
2. False
3. True
4. False
5. True
6. False
7. True
8. False
9. True
10. False
11. True
12. False
13. True
14. False
15. True
16. True
17. True
18. False
19. True
20. True

Chapter 6: Fractions

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19. 4
20.

Chapter 7: Decimals

1. 14.51
2. 10.68
3. 3.03
4. 8.68
5. 9.76
6. 5.65
7. 11.79
8. 6.20
9. 21.26
10. 59.90
11. 68.00
12. 29.70
13. 4.16
14. 8.32
15. 46.53
16. 21.035
17. 3.312
18. 7.494
19. 5.792
20. 16.117

Chapter 8: Percentages

1.
2.
3.
4.
5.
6. 50%
7. 40%
8. 52%
9. 65%
10. 27%
11. 0.245
12. 0.124
13. 0.35
14. 0.96
15. 0.2688
16. 150
17. 48.3
18. 328.5
19. 137.4
20. 56.7
21. 50%
22. 16.67%
23. 22.13%
24. 47%
25. 7.79%
26. 23.07%
27. 6.25%
28. 12.28%
29. 13.6%
30. 4.36%

Chapter 9: Divisibility

  1. Yes, 7,680 is divisible by 80.
  2. Yes, 1,798 is divisible by 62.
  3. Yes, 1,785 is divisible by 17.
  4. Yes, 4,368 is divisible by 91.
  5. Yes, 3,024 is divisible by 54.
  6. Yes, 2,756 is divisible by 52.
  7. Yes, 5,487 is divisible by 59.
  8. Yes, 8,905 is divisible by 65.
  9. Yes, 4,617 is divisible by 81.
  10. Yes, 3,198 is divisible by 13.
  11. Yes, 3,055 is divisible by 65.
  12. Yes, 6,540 is divisible by 15.
  13. Yes, 2,166 is divisible by 38.
  14. Yes, 4,386 is divisible by 43.
  15. Yes, 2,880 is divisible by 60.

Chapter 10: Squared Numbers

1. 5,625
2. 625
3. 3,025
4. 2,025
5. 4,225
6. 2,704
7. 3,025
8. 2,809
9. 2,116
10. 2,025
11. 6,724
12. 676
13. 144
14. 7,056
15. 6,084
16. 423,801
17. 877,969
18. 980,100
19. 131,769
20. 133,956
21. 1,522,756
22. 30,052,324
23. 49,154,121
24. 39,955,041
25. 1,170,724
26. 12,560
27. 6,890
28. 9,122
29. 12,233
30. 14,210

Chapter 11: Cubed Numbers

1. 157,464
2. 29,791
3. 328,509
4. 27,000
5. 91,125
6. 1,367,631
7. 1,000,000
8. 1,295,029
9. 1,481,544
10. 1,061,208

Chapter 12: Numbers to the Fourth and Fifth Powers

1. 38,950,081
2. 1,336,336
3. 24,010,000
4. 84,934,656
5. 279,841
6. 17,210,368
7. 371,293
8. 130,691,232
9. 60,466,176
10. 1,889,568

Chapter 13: Square and Cube Roots

1. 28
2. 16
3. 14
4. 29
5. 27
6. 261
7. 582
8. 306
9. 252
10. 212
11. 27
12. 36
13. 95
14. 99
15. 46
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