Grade 3 Math Makes Sense (Click here for the resource)
The layout of the textbook and files:
Introduction
Chapter 1: Pattering and place value
Chapter 2: Patterns in addition and subtraction
Chapter 3: Geometry
Chapter 4: Multiplication and division
Chapter 5: Sorting and data management
Chapter 6: Measurement
Chapter 7: Motion Geometry
Chapter 8: Exploring fractions
Chapter 9: Length, perimeter, and area
Chapter 10: Patterning in numbers and geometry
Chapter 11: Probability
Glossary of terms