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Small Groups, Big Impact

A Confident Teacher's Guide to Math That Works

Stop guessing how to implement guided math. Start teaching with clarity and purpose.
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As Seen In

Your Evenings Are Disappearing Into Math Planning...
And honestly? Your best kids are bored. Your struggling kids are falling through the cracks. And you don’t even love the way you’re teaching math right now. So what's all that planning actually doing?

Small Groups, Big Impact takes you from frustrated and guessing to confident and clear.

Every strategy comes from my actual classroom—with real kids and real constraints, not theory. I walk you through exactly how to structure your math block, use data to guide your groups, and teach with purpose instead of spinning your wheels.

By the time you close this book, you’ll know how to implement small group instruction without overwhelm, teach with real clarity, and finally have your evenings back.

See What's Inside

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Know another teacher drowning in math planning? Send them this way. This book is for anyone tired of guessing and ready to teach with a proven plan that works.

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Know another teacher drowning in math planning? Send them this way. This book is for anyone tired of guessing and ready to teach with a proven plan that works.

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Trusted by 0 + Teachers
Over 50,000 elementary teachers have used our resources to transform their instruction. This book brings together everything they've tested and loved—from someone who's still actually in the classroom doing the work.

"...clear, purposeful, and easy to put into practice..."

“Reading Small Groups, Big Impact felt like learning alongside a colleague who understands the realities of the classroom. The ideas are clear, purposeful, and easy to put into practice. My small-group instruction is more focused, and all of my students are more confident because of it.”
Taryn Weaver
2nd Grade Math Teacher

"... sitting down with Marcy and learning alongside her ..."

"Small Groups, Big Impacts was such an enjoyable and thoughtful read. As an 18-year veteran teacher, I’m not new to the concept of Guided Math. But, I truly appreciated the care Marcy took in breaking down the how behind making Guided Math an effective small-group structure. Marcy's all stuff, no fluff style, coupled with real classroom examples, keeps this book from feeling like a drab professional development book. Instead, you feel like you are sitting down with Marcy and learning alongside her as your trusted mentor and friend. Her perspective offered a fresh lens that encouraged me to pause and really reflect on how I’m currently structuring my own math block in my third-grade classroom. The practical details, paired with her clear understanding of true classroom realities, made this a book I didn’t just read and forget, but one that inspired me to revisit and refine my instructional practice in my own classroom."
Leigh Langton
Third Grade Math/Science Teacher

"... practical, doable, and grounded in real classrooms ..."

"Small Groups, Big Impact is the kind of book teachers need right now. As someone who works closely with Pre-K through 2nd grade teachers and instructional leaders across the country, I see firsthand how overwhelming math instruction can feel, especially when educators are trying to meet the diverse needs of every learner within limited time. Marcy takes something that often feels complicated and breaks it down into systems that are practical, doable, and grounded in real classrooms."
Kristen Sloan
Outreach & Partnership Leader, ESGI Software

"... not your typical professional development teacher book ..."

"Small Groups, Big Impact is not your typical professional development teacher book that sits on the shelf collecting dust. It’s one that hooks you from the beginning and makes you feel like you’re learning from a trusted teacher mentor that truly cares about you and your students. As a small town teacher in a rural farming and ranching community, I can relate to Marcy’s story and struggle of having access to quality professional development and resources. I remember returning to my hometown at the age of 21, taking on my first teaching job as a departmentalized 3rd grade math and science teacher. I wanted to teach in small groups, and without much of any guidance, I dove right in. Let’s just say… it didn’t always go as planned, and I wish I would have had this book in my hand back then, as it would have helped guide my instruction and save me so much stress and questioning. Marcy is so real and relatable, and the systems she teaches aren’t extravagant or overwhelming. They’re straightforward and doable, which is every busy teacher’s dream! If you’ve ever wanted to teach in small groups or implement the guided math framework, she’s the one you want to learn from, and Small Groups, Big Impact is definitely a book you won’t regret investing in!"
Amber Kindler
Certified K-6 Elementary Teacher

" Small Groups, Big Impact completely reframed how I think about my guided math block ..."

"Small Groups, Big Impact completely reframed how I think about my guided math block. The balance of clear structure with built-in flexibility gave me an instant springboard for new ideas—not just for myself, but for my entire teaching team. Marcy offers practical, fresh options that are realistic and classroom-ready, all while honoring one of our most precious resources: time. This book is both inspiring and empowering, and it has already influenced how we plan and teach math."
Andrea Berndt
Kindergarten Multi-Classroom Leader

"... everything you wanted your teacher prep program to teach you about implementing small group math, but didn’t ..."

"Small Groups Big Impact is everything you wanted your teacher prep program to teach you about implementing small group math, but didn’t. This book is practical, relatable, and refreshingly doable. Marcy has truly done the legwork for you, anticipating the questions teachers actually have and addressing the real struggles that come with managing math small groups in a real classroom! What I loved most was the tone. It feels like your teacher BFF is walking you through the process; honest, encouraging, and even funny. I genuinely laughed while reading, which says a lot for a professional development book. If you want to feel more confident during math time and finally make small groups work in a way that makes sense, this book is absolutely worth the read."
Colleen Rodenberger
Certified Prek-3 Elementary Teacher

"... an inspiring resource for anyone seeking to create small groups that truly make a difference."

“Having worked alongside Marcy as a 2nd grade teacher, Small Groups, Big Impact reflects a philosophy I have long believed in—the power of small groups to foster connection, confidence, and meaningful growth. Through her experience and insight, Marcy shows how effective small group instruction can be brought to life in ways that are both practical and manageable, giving teachers the guidance and empowerment they need to help students thrive. This book is an inspiring resource for anyone seeking to create small groups that truly make a difference.”
Monti Parchman
Superintendent, Cranfills Gap ISD
What's Inside

Small Groups, Big Impact Takes You Through Everything You Need to Know

Inside these pages, you'll find:

My personal math journey—why I struggled as a student and how that shaped my teaching

How to structure your guided math block using 5 simple, proven components

Step-by-step classroom and material organization so transitions flow instead of fall apart

Real examples from my actual classroom showing exactly how each component works

How to collect data that actually tells you what to teach next (no guessing required)

How to plan small group lessons based on where your students actually are, not where you think they should be

Strategies for managing small groups without chaos or constant redirection

How to make your math block work in your real classroom—not the picture-perfect version

I’m Marcy, and I’ve spent the last 14 years in elementary classrooms teaching 1st and 2nd grade. 

I’m currently a math interventionist and educational consultant, and I’ve provided professional development on mathematical instruction at the state and national levels. 

But more importantly? I’m still in the classroom doing this work every single day. Everything in this book comes from my actual experience, not theory.

You Might Be Wondering

Nope. Guided math is a framework for how to teach, not what to teach.

No! The goal is to start small with intentional changes.

That’s ok! I walk you through everything step by step. No special training needed.

Absolutely, this framework works for both self-contained and departmentalized classrooms

Ready to Teach Math with Clarity and Purpose?

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