1. คิดเลขเร็ว
1. 287 + 387 + 487 + 587 + 687 = …………………………..
2. ( 21,800 – 1,989 ) + ( 315 x 167 ) = …………………………..
3. 40,021 – ( 157 x 89 ) = …………………………..
4. ( 947,635 + 64,566 )  487 = …………………………..
5. 23,140 – ( 75 x 144 ) = …………………………..
6. (39,654 – 799) + 2,9778 = …………………………..
7. 65,407 – (24,382 + 798) = …………………………..
8. ( 8,900 x 189 ) – 17,856 = …………………………..
9. ( 24,490  158 ) + 18,287 = …………………………..
10. 51,070 – (85,600  800) = …………………………..
11. ( 847 x 786 ) + 14,879 = …………………………..
12. ( 274 x 6 )  ( 72  4 ) = …………………………..
13. (98,763 x 89 x 0 ) + (6,666  66) = …………………………..
14. 3,733 + 8888 + 444 + 655 = …………………………..
15. ( 69 x 167 ) – 2,745 = …………………………..
16. (1,200  60) + (1,458 – 99) = …………………………..
17. 187 + 187 + 187 + 187 + 189 = …………………………..
18. 21,110 – 1,956 + ( 145 x 178 ) = …………………………..
19. 40,894 – ( 157x 67 ) = …………………………..
20. 947,174 + 64,987 – 87,567 = …………………………..
21. 23,546  ( 14 x 78 ) = …………………………..
22. (45,021 – 799) + 2,977 = …………………………..
23. 65,407 – (24,542 + 798) = …………………………..
24. 8,800 x 90 – ( 9,750  125 ) = …………………………..
25. 2,222  11 + ( 15,000 – 7,854 ) = …………………………..
26. 24,150 – ( 85 x 147) = …………………………..
27. ( 72 x 456 ) – 7,897 = …………………………..

2. 28. ( 245 x 767 x 0 ) + 1,358 = …………………………..
29. ( 789 x 255 ) + ( 789 x 445 ) = …………………………..
30. ( 145 x 75 ) + ( 25 x 145 ) = …………………………..
31. ( 5,000 x 76)  250 = …………………………..
32. ( 36,024  456 ) + ( 1,990 – 99 ) = …………………………..
33. 48,753 + 29,356 – 7,867 = …………………………..
34. 26,954 – 3,765 + 15,289 = …………………………..
35. 28,673 + 15,648 = 65,210 - ………………………….
36. 14,369 + ……………= 74,105
37. 46,857 + ……………= 92,352
38. …………. + 25,348 = 78,354
39. …………. + 32,153 = 52,148
40. 55,626 - ………… =21,352
41. 76,322 – ………… = 32,614
42. …………. – 24,836 = 3,264
43. …………. – 17,928 = 35,264
44. ………… x 43 = 5,461
45. ………... x 18 = 4,572
46. 19,365 x ………= 464,760
47. 3,675 x ………. = 455,700
48. …………….  425 = 1,234
49. …………..  305 = 222
50. 9,999  ………..= 99
51. 123,456  ……….. = 643
52. 123 x 574 + 314  157 = ……………………..
53. (9,999 x9 – 99) + 10,108 =……………………..
54. 9,013 + 292 – 1,000 =………… – 1,234
55. 9,109 + 199 =…………. + 7,044 – 3,195

3. 56. 1,056 + 6,150 = 1,164 + ………….
57. 6,095 – 3,101 + 1,059 = 887 + ……………
58. 8,502 – …………… = 4,125 – 189 + 2,335
59. 8,061 + ………….. = 5,242 + 2,758 + 174
60. …………. – 161 = 6,123 – 1,451
61. 9,430 + 1,028 – 5,442 = 2,381 + …………… + 1,036
62. 14,673 – 1,246 + 954 =………….. + 1,793
63. …………… + 1,732 – 1,496 = 44,321 – 2,534
64. 15,348  …………… = 1,279
65. 6,656  104 = …………. 100
66. …………..  94 = 473
67. 3,684  ………….. = 144  12
68. 1,954 x …………… = 44,852 + 17,676
69. 142 x ………….= 30,000 + 388
70. 845  ……… = 500 – 487
71. ………….  96 = 300 + 45
72. 2,222  101 = ………… + 12
73. 5,445 ………. = 11x11
74. 8,000  125 = ………… - 36
75. (122 x 40)  80 =……………..
76. 44,592 – (176 x 167) =……………..
77. 50,000 – ( 1,428 x 20 ) =……………..
78. (395 + 456) x 176 = ………………….
79. (954  53) x 1,700 = …………………….
80. 143,725 + …………….= 179,275
81. 64,707 + ……………... = 107,809
82. …………… + 49,576 = 100,000
83. …………… + 84,321 = 248,705