# Curriculum By Math Content

*Investigations* is intentionally designed and sequenced to promote a deep understanding of mathematics. Each curriculum unit provides an in-depth study of a specific and related set of mathematical concepts and skills, in one (or sometimes two) mathematical strands. Each successive unit builds on the previous, both within and across strands, and across grades. This can be seen by looking at content-specific information, including the Math Emphases and relevant Benchmarks, from across the grades. Learn more about how the ideas develop in the following strands:

- Counting and the Number System PDF
- Addition and Subtraction PDF
- Multiplication and Division PDF
- Rational Numbers PDF
- Geometry PDF
- Measurement PDF
- Data and Probability PDF
- Patterns and Functions PDF

Important work also happens *within* the number and operations units at each grade level. Place value and early algebra are not strands of the curriculum — they are not subtitles of any *Investigations* units — but are critical components of the number and operations content K-5. Learn more about how the work on the structure of the base ten number system supports the development of computational fluency, and about what is meant by algebra in the elementary grades, including the kinds of generalizations that arise as students study number and operations.

## Learn More

## About Number and Operations

Computational Algorithms and Procedures (pdf) and Developing Computational Fluency in the Elementary Grades, by Susan Jo Russell.

Discover how *Investigations* helps students Develop Fluency with the Facts (pdf).

## About Early Algebra

Read about early algebra and how it is embedded in *Investigations* (pdf).

## About Data

What’s in a Question?, by Susan Jo Russell.

*Investigations* and the Common Core

*Investigations and the Common Core State Standards* provides additional content and suggests content to omit, in order to teach the CCSS. See correlations and information about content and pacing.