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Investigating Number Sense, Addition, and Subtraction (Grades K–3) supports the development of such fundamental topics as place value, compensation and equivalence, addition and subtraction on the open number line, and the efficient use of the five- and ten-structures.

Investigating Number Sense, Addition, and Subtraction includes

Overview Unit Books Read Aloud Books Resource Guides

An Overview book explains the series’ philosophy and components, outlines the contents of each unit, and describes how to integrate the series into your existing curriculum.

Eight unit books each comprise a two-week sequence of investigations, games, and minilessons that foster a deep conceptual understanding of essential mathematical ideas.

  • Bunk Beds and Apple Boxes: Early Number Sense
  • Beads and Shoes: Making Twos: Extending Number Sense
  • The Double-Decker Bus: Early Addition and Subtraction
  • Organizing and Collecting: he Number System
  • Measuring for the Art Show: Addition on the Open Number Line
  • Trades, Jumps, and Stops: Early Algebra
  • Ages and Timelines: Subtraction on the Open Number Line
  • The T-Shirt Factory: Place Value, Addition, and Subtraction

Eight read-aloud books set the stage for learning with rich imaginable contexts designed around landmark numbers and meaningful number relationships.

  • The Sleepover
  • Grandma’s Necklace
  • The Double-Decker Bus
  • The Masloppy Family
  • Measuring for the Art Show
  • The Masloppy Family Goes to New York
  • El Bisabuelo Gregorio
  • Grandma Eudora’s T-Shirt Factory

Three yearlong resource guides provide strings of related problems that develop students’deep number sense and expand their repertoire of strategies formental arithmetic.

  • Games for Early Number Sense
  • Minilessons for Early Addition and Subtraction
  • Minilessons for Extending Addition and Subtraction

Online Resources support your math workshop with a range of video and print resources.

Grades K–3

– Overview Book
– Unit Books
– Read-Aloud Books
– Resource Guides
– Online Resources
  • Sequence of Instruction
  • Landscape of Learning
  • Samples
  • Buy Now
  • Young Mathematicians At Work book and CDs

    Grades 3–5
    Grades 4–6