- Page 5 and 6: SECRE+S OF MEN+AL MA+H The Mathemag
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- Page 11 and 12: Contents Foreword by Bill Nye (the
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- Page 17: Foreword xv there are also an infin
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- Page 22 and 23: xx Prologue in on his secrets of
- Page 24 and 25: xxii Prologue where he learned thes
- Page 26 and 27: xxiv Introduction Too often, math i
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26 Secrets of Mental Math to 10. We
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28 Secrets of Mental Math By roundi
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30 Secrets of Mental Math mentally,
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32 Secrets of Mental Math 48 40 8
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34 Secrets of Mental Math problems
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36 Secrets of Mental Math 3-BY-1 MU
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38 Secrets of Mental Math sometimes
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40 Secrets of Mental Math 376 (300
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42 Secrets of Mental Math 925 (900
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44 Secrets of Mental Math BE THERE
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46 Secrets of Mental Math 41 2 1 42
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48 Secrets of Mental Math other squ
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50 Secrets of Mental Math WHY THESE
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52 Secrets of Mental Math Similarly
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54 Secrets of Mental Math Gardner o
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56 Secrets of Mental Math same digi
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New and Improved Products: Intermed
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60 Secrets of Mental Math 59 (60 1
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62 Secrets of Mental Math 88 (90 2
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64 Secrets of Mental Math To see ho
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66 Secrets of Mental Math Remember
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68 Secrets of Mental Math 67: 67 3
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70 Secrets of Mental Math EXERCISE:
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72 Secrets of Mental Math Rounding
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74 Secrets of Mental Math 2. The ea
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76 Secrets of Mental Math 13 1,000
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78 Secrets of Mental Math Chapter 8
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Chapter 4 Divide and Conquer: Menta
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82 Secrets of Mental Math Let’s t
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84 Secrets of Mental Math 439 52196
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86 Secrets of Mental Math In using
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88 Secrets of Mental Math 682 23 I
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90 Secrets of Mental Math 67 543657
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92 Secrets of Mental Math original
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94 Secrets of Mental Math way is to
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96 Secrets of Mental Math 6 7 8 .
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98 Secrets of Mental Math You can e
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100 Secrets of Mental Math A number
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102 Secrets of Mental Math Divisibi
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104 Secrets of Mental Math It is al
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106 Secrets of Mental Math So, To a
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Chapter 5 Good Enough: The Art of
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110 Secrets of Mental Math Notice t
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112 Secrets of Mental Math 8,367 5
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114 Secrets of Mental Math onds doe
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116 Secrets of Mental Math We obser
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118 Secrets of Mental Math Divide:
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120 Secrets of Mental Math roots. I
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122 Secrets of Mental Math MORE TIP
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124 Secrets of Mental Math I will s
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126 Secrets of Mental Math number o
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128 Secrets of Mental Math and sinc
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130 Secrets of Mental Math EXERCISE
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132 Secrets of Mental Math COLUMNS
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134 Secrets of Mental Math As illus
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136 Secrets of Mental Math 4. 3 5 8
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138 Secrets of Mental Math Next, we
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140 Secrets of Mental Math You have
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142 Secrets of Mental Math 853 762
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144 Secrets of Mental Math Step 4.
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146 Secrets of Mental Math Shakunta
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148 Secrets of Mental Math Here’s
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150 Secrets of Mental Math EXERCISE
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152 Secrets of Mental Math work by
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154 Secrets of Mental Math words: m
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156 Secrets of Mental Math 93: bum,
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158 Secrets of Mental Math And: 69
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160 Secrets of Mental Math 42 384
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162 Secrets of Mental Math 362 beco
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164 Secrets of Mental Math learned
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166 Secrets of Mental Math Once you
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168 Secrets of Mental Math Thomas F
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170 Secrets of Mental Math numbers
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172 Secrets of Mental Math Then do
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174 Secrets of Mental Math 629 (630
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176 Secrets of Mental Math 858 15
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178 Secrets of Mental Math Using th
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180 Secrets of Mental Math Adding 8
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182 Secrets of Mental Math If both
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184 Secrets of Mental Math I diagra
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186 Secrets of Mental Math In our n
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188 Secrets of Mental Math produces
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190 Secrets of Mental Math be conve
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192 Secrets of Mental Math (e.g., 4
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194 Secrets of Mental Math As with
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196 Secrets of Mental Math I should
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198 Secrets of Mental Math Since yo
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200 Secrets of Mental Math 3. divid
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202 Secrets of Mental Math Hence, a
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204 Secrets of Mental Math 2 on lin
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206 Secrets of Mental Math 1 5 2
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208 Secrets of Mental Math The quot
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210 Secrets of Mental Math ask the
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212 Secrets of Mental Math the squa
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214 Secrets of Mental Math Why This
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216 Secrets of Mental Math rest of
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218 Secrets of Mental Math Year Cod
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220 Secrets of Mental Math For date
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Chapter ∞ Epilogue: How Math Help
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224 Secrets of Mental Math There is
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226 Secrets of Mental Math seniors,
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228 Secrets of Mental Math investig
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230 Secrets of Mental Math 7. Is th
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Answers CHAPTER 1: A LITTLE GIVE AN
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Answers 235 Three-Digit Subtraction
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13. 757 14. 259 15. 297 297 16. or
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Answers 239 2 100 5. 98 2 9600 2 2
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Answers 241 2-by-2 Addition-Method
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2-by-2 Factoring-Method Multiplicat
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Answers 245 13. 38 63 (9 7) 15.
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Answers 247 234 17 3. 217 2 46,800
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Answers 249 CHAPTER 4: DIVIDE AND C
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Answers 251 23. 4,425,575 No: 4 4
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Answers 253 7. 7 8 1 1 4 1
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Answers 255 9. 104,972 10. 5,462,74
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Square Root Guesstimation (page 150
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3-by-2 Exercises Using Factoring, A
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21. 281 or 281 (280 1) 44 (11 4
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Answers 263 3. 58,324 2 “Liver”
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3-by-3 Multiplication (page 192) 1.
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Answers 267 13. 783 (87 9) 589 1
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Answers 269 5-by-5 Multiplication (
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Bibliography RAPID CALCULATION Cutl
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Index addition: an “amazing” su
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Index 275 factoring a number: in th
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Index 277 three-by-two problems, 16
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About the Authors DR. ARTHUR BENJAM