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Instructor Overview

Students use double number lines to model relationships and to solve ratio problems.

Key Concepts

Double number line diagrams are useful for visualizing ratio relationships between two quantities. They are best used when the quantities have different units. (The unit rate appears paired with 1.) Double number line diagrams help students more easily “see” that there are many equivalent forms of the same ratio.

Goals and Learning Objectives

  • Understand double number line diagrams as a way to visually compare two quantities.
  • Use double number line diagrams to solve ratio problems.