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Read this one DMT Insights Are Your Students Really Understanding Line Plots? This DMT Insight examines why students commonly misinterpret line plots, focusing on confusion between quantities and counts as well as misunderstanding symbols like X marks. It shares research-based strategies—such as clear language, visual mo Watch DMT Insights Are Your Students Really Understanding Line Plots? This DMT Insight examines why students commonly misinterpret line plots, focusing on the confusion between quantities and counts, as well as misunderstandings of symbols like X marks. DMTI Overviews Geometry / Measurement / Data (3-5) Watch DMT Insights Assessing Student Understanding This unit overview presents the DMT assessment framework, which guides educators in assessing student understanding in mathematics through a multi-level approach encompassing skill-based, problem-solving, conceptual, and reasoning tasks to identify m Watch DMT Insights Bridging Core and Intervention Curricula This DMT Insight clarifies the distinct roles, structures, and best practices of core and intervention math curricula, highlighting how their purposeful alignment and integration can better meet diverse student needs and address persistent gaps Watch DMT Insights Building Place Value Proficiency: Key Insights from Educational Studies Research highlights the critical role of visual representations in developing students’ conceptual understanding of place value. Watch DMT Insights Building Stronger Math Thinkers Through Progressive Formalization This DMTI Insight explains how progressive formalization guides students from intuitive, hands-on math experiences toward a deep understanding of formal mathematical concepts. DMTI Overviews Watch DMT Insights Developing Percentage Proficiency This DMT Insight explores effective strategies for teaching percentages, addresses common student challenges, and provides evidence-based recommendations to help educators improve their instruction of this topic. Watch DMT Insights DMT Insight 01 Taking Students Ideas Seriously This DMT Insight describes how taking students' initial ideas seriously, building on their intuitive knowledge, and engaging in crucial cognitive processes improve long-term understanding and skills. Watch DMT Insights DMT Insight 02 How Math Models Transform Learning This DMT Insight describes how mathematical modeling (inactive, iconic, and symbolic) bridges intuitive understanding with formal mathematical reasoning to improve understanding and problem-solving skills. Watch DMT Insights DMT Insight 03 Prioritizing Conceptual Learning This DMT Insight describes prioritizing conceptual understanding before procedural skills to enhance students' long-term learning. Watch DMT Insights DMT Insight 04 Focusing on Mathematical Structure This research examines the role of mathematical structure in mathematics, emphasizing structural language such as unit, compose, decompose, iterate, partition, and equal enhance reasoning. Watch DMT Insights DMT Insight 06 Early Predictors of Math Success This DMT Insight highlights the importance of spatial reasoning and measurement skills as early predictors of long-term success in mathematics. Watch DMT Insights DMT Insight 07 The Learning Trifecta This DMT Insight explores approaches in mathematics education that prioritize long-term learning: emphasizing productive struggle, minimizing excessive hints, and implementing varied practice. Watch DMT Insights DMT Insight 08 Foundations in Number Sense Early mathematics education shapes students' long-term mathematical understanding and problem-solving abilities. A key component of this is developing number sense. Watch DMT Insights DMT Insight 10 The Power of Division This DMT insight highlights division as a fundamental mathematical operation crucial in developing numerical understanding and problem-solving skills. Division Multiplication / Division (3-5) Watch DMT Insights DMT Insight 38 - Number Lines Should Be Built This DMT Insight shows how letting students build number lines, not just use them, strengthens their structural understanding by helping them reason about units, scale, and magnitude, improving number sense, measurement skills, and graphing. Watch DMT Insights DMT Insight 47 - Teaching Ratio Tables This DMT Insight explores how ratio tables serve as a flexible symbolic structure that bridges visual and algebraic reasoning, helping K–8 students develop deep multiplicative and proportional thinking by moving from sequential unit iteration to stra Division Multiplication / Division (3-5) Watch DMT Insights DMT Insight 49 - Bar Models and Word Problems Why Students Struggle with Word Problems and How Bar Models Help. This DMT Insight explains why students who can compute still freeze on word problems and how bar models give them a way to think. DMTI Overviews Resources Watch DMT Insights DMT Insight 50 - Digital Dependence Insight 50 examines cognitive outsourcing in mathematics, what happens when a digital tool performs the mental work students still need to do for themselves, and argues that student-drawn models, handwritten work, and effortful retrieval build the co Read this one DMT Insights DMT Insight 51 - Place Value This DMT Insight breaks place value into its key developmental understandings and gives grades 3–6 teachers diagnostic items that reveal whether students truly grasp units and magnitude—or are only naming places. Place Value (3-5) Whole Numbers (3-5) Watch DMT Insights DMT Insight 51 - Place Value -- The Understanding that Predicts Later Math Success This DMT Insight breaks place value into its key developmental understandings and gives grades 3–6 teachers diagnostic items that reveal whether students truly grasp units and magnitude, or are only naming places. Place Value (K-2)

PD Video Developing Mathematical Thinking Framework PD Video Addition and Subtraction Fluency: Introduction to the Strategies PD Video Fractions: Visual Model Progression PD Video Measurement: Length Misconceptions and the Broken Ruler PD Video Geometry: Quadrilateral Hierarchy PD Video Decimal Concepts: Introduction PD Video Modeling Compare Problems PD Video Ratio and Proportion: Using Context, Ratio Tables, and Models