Dimensions Math 3B Textbook

This 236-page, full-color textbook guides third-graders through second-semester topics including multiplication and division with 6, 7, 8, and 9, fractions, geometry, measurement, and area and perimeter. Each lesson follows a distinctive pedagogical structure: Chapter Openers present engaging scenarios to activate prior knowledge, Think sections guide students to explore problems using multiple solution methods, Learn components formalize concepts with definitions, and Do problems provide opportunities for teacher-led discussion or independent practice. Exercise markers link to corresponding workbook problems for additional reinforcement.

The Singapore Math approach emphasizes mental math strategies and challenging word problems that move beyond rote calculation. Students develop concepts through increasing levels of abstraction, working from concrete exploration to formal understanding. Periodic practice sessions throughout the semester support consolidation and assessment, while two cumulative reviews reinforce skills across multiple chapters. The curriculum includes built-in differentiation—teachers can select which practice problems students complete based on individual needs rather than requiring every student to work every problem.

Dimensions Math divides the school year into two semesters; this 3B textbook covers the second half and requires the corresponding 3B workbook and instructor's guide. Both 3A and 3B materials are necessary for a complete third-grade year. The three components—textbook, workbook, and guide—each serve distinct functions that work together to build mathematical mastery.