What happens when you shift math from being about rote memorizing and mimicking to focusing on strategies, thinking, and reasoning? There is no one better than Pam Harris to guide you in this important path—and this one is for you, grade 3–5 teachers!

Jo Boaler, Stanford University

In this book, Pam Harris continues her quest to make math figure-outable—this time for grade 3–5 teachers. Through real classroom examples, Harris teaches us how addition, subtraction, multiplication, and division strategies should be experienced and understood, and she gives us the tools to teach these central ideas in mathematics.

Peter Liljedahl, Simon Fraser University

Through extensive use of representations and illustrations, Pam Harris effectively illustrates how to develop reasoning strategies developmentally across the operations. Smudge problems and number strings appearing throughout the book provide enriching ideas for how to help students make sense of strategies and become reasoners. An excellent, practical resource for developing computational fluency.

Jennifer M. Bay-Williams, University of Louisville

Pam Harris has done it again! Upper elementary teachers will be grateful to have this resource. Harris shares the why and the how to support students with developing mathematical reasoning so they can use mathematics to make an impact on the world. She offers practical strategies alongside examples from teachers and students engaging in powerful math experiences. This book will truly change the game as we build a community of Mathers together!

Deborah Peart Crayton, My Mathematical Mind

Brilliant book—absolutely transformative! This comprehensive analysis delivers game-changing insights through its detailed examination of strategies and models. Every section captivated me with thought-provoking content that shifted my perspective entirely. The fresh viewpoints sparked innovative ideas I’m excited to implement. From start to finish, this work combines depth with accessibility brilliantly!

Dr. Nicki Newton, Newton Education Solutions

Standard algorithms, those remnants of a pre-computing era that are often disparaged by regular people and math educators alike, remain quite common in school mathematics. Pam Harris not only critiques the standard algorithms but builds up worthy replacements with mathematical reasoning and big ideas to support student learning. Her expertise across grade levels has led to a fun and useful book series.

Samuel Otten, University of Missouri

Developing Mathematical Reasoning: The Strategies, Models, and Lessons to Teach the Big Ideas in Grades 3–5 offers a clear, well-structured progression of strategies designed to build deep conceptual understanding in the elementary classroom. Particularly noteworthy are the classroom vignettes, which vividly illustrate the real-world application of problem strings and rich tasks. These examples not only highlight effective instructional practices but also demonstrate how mathematical reasoning can thrive in diverse classroom settings.

Brendan Scribner, Scrib Mather, LLC.

Pam Harris has always been competent and gritty about enhancing mathematical understanding. This latest book provides teachers with invaluable strategies and insights, making it an essential resource for fostering critical mathematical reasoning in students.

India White, National Education Consultant

This book is a must-have for anyone teaching math differently than they learned it. It is deeply instructive, without being intimidating. The visuals, examples, and classroom-based vignettes deliver countless aha moments and deliver the ‘why’ behind the strategies and models. If math is something you’ve avoided, this book will give you the confidence you need!

Alison J. Mello

Another amazing Pam Harris book to add to your collection! She has created a comprehensive resource for ALL math teachers in grades 3 to 5. This book covers what you need to know about teaching the major strategies for the main math operations, so that you can create a classroom that emphasizes thinking and reasoning every year.

Danika Murray, York House School

For educators seeking a clear and comprehensive understanding of the major strategies for teaching the four operations, this book is an invaluable resource. It offers deep insights into numerical relationships and will strengthen both your mathematical understanding and instructional practice—and you’ll see these strategies in action through the included links and videos!

Laura Vizdos Tomas, School District of Palm Beach County

Pam Harris has delivered a comprehensive resource for teachers to fully understand how to develop mathematical reasoning with their grade 3–5 students. This book equips teachers with knowledge about the major strategies students need to have for each operation with whole numbers, decimals, and fractions. It is the most thorough compilation of all the strategies needed for 3–5 students to truly build and develop their mathematical reasoning relationships and mental connections. After reading this book, you will be inspired to teach with the clear goal of empowering your students to do math like mathematicians and develop relationships and connections that build students’ mathematical reasoning abilities.

Susan Smith, Lakota Local Schools

This book is for elementary teachers and anyone who wants to deepen their own understanding and help students truly learn. It empowers teachers to make sense of the math for themselves so they can create classrooms where every child can make sense of it. Developing Mathematical Reasoning: The Strategies, Models, and Lessons to Teach the Big Ideas in Grades 3–5 will transform how teachers teach mathematics. Our students deserve to experience math in a way they can understand, it and this book will help you achieve that!

Marria Carrington, Mount Holyoke College

Pam Harris changed the way I think about math and the way I teach math. This book is the equivalent of her being in your classroom to coach you whenever you need it!

Patrice Tucker, St. Cecilia Catholic School

Developing Mathematical Reasoning: The Strategies, Models, and Lessons to Teach the Big Ideas in Grades 3–5 is a practical and inspiring guide for teachers who want to center student thinking in math. As an instructional coach, I appreciate how it bridges research and everyday classroom practice. The strategies are clear, the examples are authentic, and the emphasis on reasoning speaks directly to what math educators are looking for.”

Melynee Naegele, Osage County Interlocal Cooperative

Pam Harris’s book is a must-have for teachers. It takes the guesswork out of what strategies to teach and how, offering clear examples and practical guidance. With methods that spark curiosity and make computation meaningful, this resource will transform math classrooms into vibrant spaces for reasoning and problem solving.

Jennifer Lempp

If you want to expand your mathematical content knowledge and gain confidence in your mathematical pedagogy, this book does both! Pam Harris challenges readers to think deeply about mathematical concepts and approach problems with efficient strategies.

LaVon McLeod, Stark County Educational Service Center

I have been a math educator for over 30 years and always felt that something was missing in my style of teaching. I researched and tried many new ideas over the years. This book’s idea of using strategies and mathematical reasoning with high dose patterning was my missing piece. Since I have started strengthening my own number sense, I have now adopted this with all my students.

Tonya Beth Roberts, Henderson County Schools

Pam Harris has a gift for unpacking the various ways in which students can learn the fundamental skills of mathematics. Her focus is clear: help students progress through various math concepts by using reasoning skills and conceptual understanding. I learned so much reading this book, and I’m confident you will too.

Liesl McConchie, Math With the Brain in Mind

If you’re a teacher who wants your students to be sense-makers, fluent and flexible thinkers, and empowered as learners of mathematics, then this is the book for you. Pam Harris has brought together important threads in mathematics education in a refreshingly rigorous and practical way: developing foundational mathematical skills, building connections and using logic, equipping teachers with practical tools, and supporting all students to effectively learn math—real math!

Michaela Epstein, Math Teacher Circles

Pam Harris is the queen of two things: problem strings and helping us understand the progression of how students develop mathematical reasoning. This book combines both with practical advice and activities 3rd–5th grade educators will keep on their desk for easy access.

Christina Tondevold, Build Math Minds

Pam Harris’s latest book is an excellent guide for teachers who want to build true fluency through deliberate, sense-making instruction rather than scripted routines. She shows how to design purposeful lessons that develop efficient mental strategies and flexible thinking. With her practical insights, teachers can help students connect ideas, reason with numbers, and approach computation with confidence and understanding.

Carrie S. Cutler, University of Houston

I feel that this book represents the kind of paradigm shift mathematics education needs. This book is a valuable resource. I would recommend it to our partner districts and include it in our professional development resources.

John Tapper, All Learners Network

Pam Harris has an incredible way of helping teachers make sense of reasoning. This book strengthens our own understanding so we can better support the students we serve. It connects models, strategies, and big ideas in ways that build teacher confidence and deepen student reasoning. Every page reminds us that when teachers grow in understanding, students thrive.

Graham Fletcher