This book explores the development of elementary students' understanding of the mathematics of measure, and demonstrates how measurement can serve as an anchor for supporting a deeper understanding of number operations and rational numbers. It is relevant for scholars, teacher educators, and specialists in math education.

1. Measure is Fundamental 2. The Context, Goals, and Design of the Research 3. Origins of Quantitative Reasoning in the Measure of Length 4. Creating New Quantities in the Dynamic Generation of Area 5. Extending Motion to Three Dimensions: Volume and Its Measure 6. Integrating Figure and Motion in the Measure of Angle 7. Measurement Models of Arithmetic Operations and Rational Number 8. Highlights of Student Learning Research 9. Teacher Learning 10. Measures and Models in Elementary Science