• Register 9, and the 10th person goes free!

  • The Investigations Center for Curriculum and Professional Development is offering a series of free Author Talks. Attend them live or listen to recordings after.

  • A coherent sequence of math ideas

    Student thinking and making sense are key

    Based on the work of real teachers and students

    Goals and guiding principles remain the same

  • 8 Units per grade

    Approximately 140 Sessions per grade


    Options: print, digital, a blend of both

  • Embedded differentiation includes: Session-specific intervention, extension, and ELL suggestions

    Tags identify generalizable strategies

    Additional Intervention, Practice, Extension activity per Investigation

    Spanish Companion

  • Daily opportunities for formative assessment

    Unit Benchmarks

    Assessment Checklists

    Quizzes (grades 1-5)

    Embedded Assessments (grades 1-5)

  • The Mathematical Practices are deeply embedded in the fabric of the curriculum

    Explicit and careful attention to ways of thinking and working in mathematics

    2 highlighted Mathematical Practices per Unit; sidebars point out examples of all 8

    Checklists for assessing the Practices

  • Mathematics in This Unit and Mathematical Practices in This Unit Essays

    Sidebars: math, pedagogy, Math Practices

    Teacher Notes

    Dialogue Boxes

  • Daily Practice: Classroom Routines (K-2), Ten-Minute Math (3-5), and Practice Pages (grades 1-5)


    Homework, increasing in amount over the grades

  • Digital Tools


    Teacher presentations

    Assign and review student work

    Games Center

    Math Words and Ideas

    Access for families

We are excited to announce the release of the 3rd edition!

Investigations 3 is a focused, coherent, and rigorous K-5 mathematics curriculum. Fully aligned to the content and practice standards of the Common Core State Standards (CCSS), deep and careful attention is paid to mathematics content and to student thinking and understanding. Making sense of mathematics is the heart of the work, for students and teachers.

The culmination of over 25 years of research and development aimed at improving the teaching and learning of elementary mathematics, Investigations 3 maintains and builds on the philosophy and pedagogy of the first and second editions, and continues to be based on the work of real teachers and students. The goals remain the same, as do the underlying guiding principles.

Some important features of the 3rd edition:

Guiding Principles
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  • Students have mathematical ideas. The curriculum supports all students in developing and expanding those ideas.

  • Teachers are engaged in ongoing learning about mathematics content, pedagogy, and student learning. The curriculum supports them in this learning.

  • Teachers collaborate with the students and curriculum materials to create the curriculum as enacted in the classroom. The curriculum provides a clear, focused, and coherent mathematical agenda and supports teachers in implementing in a way that accommodates the needs of their particular students.

Standards for Mathematical Practice
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Developing an understanding of what it means to do mathematics is fundamentally about the practices of the discipline. Investigations has always integrated into the learning sequence those core mathematical practices that focus on reasoning, communication, and making sense. Investigations 3 makes explicit the Mathematical Practices (as defined by the CCSS) that have always been embedded in the materials. Support material for teachers—an essay about the two practices highlighted and assessed in each unit and sidebars that indicate opportunities for engaging students in all of the practices—provides images of what these practices look like in the elementary classroom, explains how math practices interact with math content, and offers guidance for helping young students learn how to use these practices in their mathematical work.

Multiple Forms of Assessment
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Investigations 3 supports teachers in assessing what students do and do not yet know in a variety of ways. There are daily opportunities for formative assessment (i.e. Observing the Students at Work). There are also three kinds of formal assessment: checklists to track information about the Mathematical Practices and about Benchmarks that can best be assessed via observation (K-5); brief Quizzes every 8-10 Sessions that familiarize students with a variety of test question formats (1-5); and embedded assessments that ask students to show and/or explain their work (1-5). Assessment Teacher Notes accompany embedded assessments, and provide analysis of student work that meets, partially meets, or doesn’t yet meet the benchmark, as well as suggestions for what to do with students in the latter two categories.

Support for the Range of Learners
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All teachers are faced with the challenge of meeting the needs of the range of learners in their classrooms, which can include students who struggle or excel in certain areas of mathematics (but perhaps not in others), students who are learning English, and students who have particular learning needs. Investigations 3 provides such support on several levels. Most Sessions have some combination of activity-specific intervention, extension, and/or ELL suggestions. These are labeled with tags that describe generalizable strategies for differentiation (e.g. suggest a tool, provide sentence stems). An additional Intervention, Practice, and Extension activity is also included at the end of each Investigation (1-5), and a Spanish Companion provides teacher dialogue in Spanish.

Embedded Professional Development
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From the beginning, Investigations was designed as a tool for teacher as well as student learning. Professional development resources embedded in the curriculum include Teacher Notes and Dialogue Boxes, found at the end of each unit, sidebar notes in the Sessions, and essays at the beginning of each unit about mathematics content and the Mathematical Practices that are the focus of that unit. Together, these resources form a tool for professional development-- a tool that supports teachers in learning about mathematics content and practices, how students learn, and effective pedagogy.

Investigations Author Talks

A series of webinars about Investigations 3.

Investigations PD

Click here to learn more about our professional development opportunities.

Investigations 3 is published by Pearson. For information about components and ordering, and for a digital tutorial, visit Pearson.

Investigations 3 was developed at TERC and is based in part on work supported by the National Science Foundation.