51 Brand New Esti-Mysteries!  4 Challenge Levels!  All New Images!  Esti-mysteries are math puzzles based in number estimation! Students are challenged to guess the correct number while being provided clues over a period of time. Esti-mysteries are accessible through hyperlinked powerpoints. Great fun and excellent for teaching math concepts!
                         
                        
                            
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                problem solving math games PowerPoint lessons printable worksheets number sense and numeration K-12 math puzzle math estimation math mystery guessing game downloadable content