This book contains 15 chapters: (1) "Teaching Problem Solving"; (2) "Using Calculators and Computers in Elementary School Mathematics"; (3) "Organizing for Instruction"; (4) "Teaching Numeration of Whole Numbers"; (5) "Teaching Numeration of Common and Decimal Fractions"; (6) "Teaching Addition and Subtraction of Whole Numbers"; (7) "Teaching Multiplication and Division of Whole Numbers"; (8) "Teaching Addition and Subtraction of Common and Decimal Fractions"; (9) "Teaching Multiplication and Division of Common and Decimal Fractions"; (10) "Teaching Measurement"; (11) "Teaching Geometry"; (12) "Teaching Rates, Ratios, Proportions, and Percents"; (13) "Teaching Statistics and Probability"; (14) "Teaching Integers and Their Operations"; and (15) "Teaching Number Patterns and Theory." The two appendices include discussions on "Calculators and Computers" and "Mainstreaming--Can Individual Needs be Met"? The chapters in this book reflect the strands taught in the elementary school mathematics curriculum. Throughout each chapter are collections of problem sets that divide the chapter into sections. A number of these problems are similar to lessons that could be used with elementary school children. (PK)