Welcome to THE PILLARS OF POWER.
Mental math skill is just like any physical athletic skill. It takes practice to be truly good. And if you want to STAY good, you have to practice regularly.
We at themathlab.com created the drill below to keep ourselves in top mental shape. We do this exercise every month just to keep our "math muscle" toned. IT REALLY REALLY WORKS.
The challenge is to answer 155 multiplication problems mentally, in 15 minutes. That is about 6 seconds per problem. The problems explore the facts from 1x11 to 20x20.
We created the "Pillars of Power" challenge to help you become your very best. It may take you a while to master this challenge, but the mental strength that you gain will make it worth the effort.
Please feel free to go through ALL of the mental math multiplication tricks that we offer in THE POWER ZONE. It is almost impossible to do the "Pillars" without some good mental tricks up your sleeve. Actually they were designed to FORCE you to learn a few multiplication tricks.
Also feel free to print out as many of the "Pillars of Power" worksheets as you like. Many people feel more comfortable with a pencil and paper when they attempt this challenge. Just set a kitchen timer and work as fast as you can. Answers are provided for you to check your work.
*NOTE: We STRONGLY urge you NOT TO TIME YOURSELF until you can do them all at 100% correctness untimed. It is simply too frustrating to do this under a time condition until you really know all the facts or can figure them out easily.
1. 18x20
2. 19x20
3. 18x19
4. 19x19
5. 18x18
6. 12x17
7. 17x17
8. 17x18
9. 20x20
10. 16x20
11. 17x20
12. 12x20
13. 13x19
14. 11x15
15. 17x19
16. 13x18
17. 15x20
18. 14x17
19. 13x15
20. 14x20
21. 11x20
22. 16x19
23. 12x18
24. 11x16
25. 15x7
26. 11x17
27. 12x13
28. 14x14
29. 16x17
30. 12x14
31. 11x13
32. 14x19
33. 12x15
34. 15x19
35. 14x16
36. 16x18
37. 13x20
38. 14x15
39. 11x19
40. 13x14
41. 12x19
42. 16x16
43. 11x11
44. 13x16
45. 15x16
46. 11x12
47. 13x17
48. 12x12
49. 15x15
50. 13x13
51. 11x18
52. 14x18
53. 11x14
54. 15x18
55. 12x16
56. 9x18
57. 9x16
58. 14x5
59. 17x10
60. 20x5
61. 13x5
62. 9x19
63. 5x17
64. 4x13
65. 10x11
66. 9x13
67. 10x12
68. 4x18
69. 14x9
70. 20x9
71. 16x4
72. 5x12
73. 9x12
74. 5x19
75. 4x19
76. 10x19
77. 9x17
78. 4x17
79. 16x10
80. 15x9
81. 4x11
82. 5x16
83. 10x13
84. 15x4
85. 5x15
86. 4x12
87. 5x11
88. 9x11
89. 10x4
90. 5x18
91. 10x15
92. 14x4
93. 18x10
94. 20x10
95. 4x20
96. 20x8
97. 8x18
98. 6x14
99. 8x14
100. 7x19
101. 13x7
102. 6x18
103. 16x8
104. 8x11
105. 6x11
106. 7x12
107. 8x15
108. 6x19
109. 12x8
110. 18x7
111. 6x13
112. 7x16
113. 14x7
114. 7x17
115. 18x9
116. 20x7
117. 15x6
118. 7x15
119. 13x8
120. 17x6
121. 17x8
122. 12x6
123. 7x11
124. 6x16
125. 6x20
126. 14x2
127. 1x18
128. 16x1
129. 3x19
130. 2x13
131. 1x14
132. 2x19
133. 3x15
134. 1x17
135. 16x3
136. 2x15
137. 3x11
138. 16x2
139. 3x14
140. 18x1
141. 17x3
142. 2x18
143. 1x15
144. 12x3
145. 1x19
146. 1x12
147. 20x1
148. 2x11
149. 3x18
150. 20x2
151. 1x11
152. 2x17
153. 13x3
154. 1x13
155. 2x12
Score = Correct answers:
If you didn't get 100% correct, don't clear it. Go back over them, and see if you can catch your mistake(s).
If you earned 100%, you can now attempt the time challenge of doing this at 100% correctness in 15 MINUTES.
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