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Twenty More Problem Solving Skills for Math Competitions
Price: $24.99

Chapter 1 Modular Arithmetic (sample. click to open the pdf file)                     1

Chapter 2 Divisor and Divisibility                                                                    18

Chapter 3 Last Digit and Remainder                                                               40

Chapter 4 Number Bases                                                                               52

Chapter 5 Special Numbers                                                                            66       

Chapter 6 Diophantine Equations                                                                    77

Chapter 7 Permutations of Digits and Sum of N-Digit Numbers                       90

Chapter 8 Arithmetic Sequence  and Common Terms                                     111

Chapter 9 Absolute Value and Inequalities                                                     125    

Chapter 10 Probability Problems                                                                   146

Chapter 11 Recurrence Relations                                                                  169

Chapter 12 Consecutive Integers                                                                   198

Chapter 13 Proportion and Slow/Fast Watch Problems                                 212

Chapter 14 Words Problems Related to Work                                              227
Chapter 15 Net (sample. click to open the pdf file)                                       242  

Chapter 16 Longest Path and Shortest Distance                                             269

Chapter 17 Folding Paper                                                                              289

Chapter 18 Problems with Analytic Geometry                                                 307

Chapter 19 Grids                                                                                            322

Chapter 20 Back Calculation                                                                          335

 
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