Welcome to Investigations

Investigations is a complete K-5 mathematics curriculum, developed at TERC in Cambridge, Massachusetts. It is designed to help all children understand fundamental ideas of number and operations, geometry, data, measurement and early algebra.

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Investigations Unit Guides

Written by the authors of Investigations, Unit Guides are now available for purchase from TERC. These independent study guides help teachers work through each of the 52 units in Investigations. Learn More »

Professional Development Institute

The Professional Development Institute is designed for math leaders and coaches responsible for professional development in the first two years of implementation of the 2nd edition of Investigations in Number, Data, and Space. Learn More »

Workshops and Institutes by TERC

Download a brochure that describes professional development opportunities designed by the authors of Investigations, or visit the Investigations Workshops website.

The Re-Vision of Investigations

A major revision (supported by the National Science Foundation, TERC, and Pearson) is now available. Read more about the work that brought about the new edition. Read More »

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Investigations in Number, Data, and Space was developed at TERC and funded in part by the National Science Foundation.