secrets-of-mental-math-malestrom

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240 Answers 5 60 14. 55 2 3000 5 2 3025 5 50 5 80 15. 75 2 5600 5 2 5625 5 70 5 50 16. 45 2 2000 5 2 2025 5 40 4 88 17. 84 2 7040 4 2 7056 4 80 3 70 18. 67 2 4480 3 2 5625 3 64 3 106 19. 103 2 10,600 3 2 10,609 3 100 8 216 20. 208 2 43,200 8 2 43,264 8 200 CHAPTER 3: NEW AND IMPROVED PRODUCTS Multiplying by 11 (page 58) 1. 35 3 5 385 2. 48 4 8 528 8 12 11 3. 94 9 4 1034 11 13 11
Answers 241 2-by-2 Addition-Method Multiplication Problems (page 59) 1. 31 (30 1) or 41 30 41 1230 1 41 41 1271 2. 27 (20 7) 3. 18 20 18 360 7 18 126 486 4. 53 (50 3) 5. 58 50 58 2900 3 58 174 3074 6. 23 (20 3) or 84 20 84 1680 3 84 252 1932 7. 62 (60 2) 8. 94 60 94 5640 2 94 188 5828 9. 92 (90 2) 35 90 35 1230 2 35 70 3220 41 40 31 1240 1 31 31 1271 26 50 26 1300 9 26 234 1534 43 40 77 3080 1 41 231 3311 84 80 23 1840 4 23 92 1932 76 80 76 6080 8 76 608 6688 31 (40 1) 59 (50 9) 77 (40 3) 23 (80 4) 88 (80 8) 10. 34 3 4 374 or 340 11. 85 8 5 935 or 850 11 34 11 13 85 7 374 935
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This book has been optimized for vi
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SECRE+S OF MEN+AL MA+H The Mathemag
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I dedicate this book to my wife, De
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Contents Foreword by Bill Nye (the
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Foreword by Bill Nye (the Science G
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Foreword xiii Well, actually, I hop
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Foreword xv there are also an infin
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xviii Foreword math nut. Immunizati
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xx Prologue in on his secrets of
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xxii Prologue where he learned thes
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xxiv Introduction Too often, math i
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2 Secrets of Mental Math 35 2 What
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4 Secrets of Mental Math Absolutely
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6 Secrets of Mental Math Similarly,
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8 Secrets of Mental Math Although I
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10 Secrets of Mental Math Exception
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12 Secrets of Mental Math math in y
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14 Secrets of Mental Math 67 28 8
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16 Secrets of Mental Math 858 7 re
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18 Secrets of Mental Math lot easie
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20 Secrets of Mental Math Carl Frie
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22 Secrets of Mental Math Of course
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24 Secrets of Mental Math 958 417
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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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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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86 Secrets of Mental Math In using
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88 Secrets of Mental Math 682 23 I
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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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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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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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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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Page 246 and 247: 220 Secrets of Mental Math For date
Page 248 and 249: Chapter ∞ Epilogue: How Math Help
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Page 252 and 253: 226 Secrets of Mental Math seniors,
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Page 256 and 257: 230 Secrets of Mental Math 7. Is th
Page 259 and 260: Answers CHAPTER 1: A LITTLE GIVE AN
Page 261 and 262: Answers 235 Three-Digit Subtraction
Page 263 and 264: 13. 757 14. 259 15. 297 297 16. or
Page 265: Answers 239 2 100 5. 98 2 9600 2 2
Page 269 and 270: 2-by-2 Factoring-Method Multiplicat
Page 271 and 272: Answers 245 13. 38 63 (9 7) 15.
Page 273 and 274: Answers 247 234 17 3. 217 2 46,800
Page 275 and 276: Answers 249 CHAPTER 4: DIVIDE AND C
Page 277 and 278: Answers 251 23. 4,425,575 No: 4 4
Page 279 and 280: Answers 253 7. 7 8 1 1 4 1
Page 281 and 282: Answers 255 9. 104,972 10. 5,462,74
Page 283 and 284: Square Root Guesstimation (page 150
Page 285 and 286: 3-by-2 Exercises Using Factoring, A
Page 287 and 288: 21. 281 or 281 (280 1) 44 (11 4
Page 289 and 290: Answers 263 3. 58,324 2 “Liver”
Page 291 and 292: 3-by-3 Multiplication (page 192) 1.
Page 293 and 294: Answers 267 13. 783 (87 9) 589 1
Page 295 and 296: Answers 269 5-by-5 Multiplication (
Page 297 and 298: Bibliography RAPID CALCULATION Cutl
Page 299 and 300: Index addition: an “amazing” su
Page 301 and 302: Index 275 factoring a number: in th
Page 303 and 304: Index 277 three-by-two problems, 16
Page 305: About the Authors DR. ARTHUR BENJAM
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