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.