# Activities

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• • ##### Author 6-8

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• TI-Nspire™ CX/CX II
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• ##### Software

TI-Nspire™
TI-Nspire™ CAS

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Double Number Lines

#### Activity Overview

This activity allows students to reason about ratio tables, which helps their understanding of what a ratio describes in a context and what quantities in equivalent ratios have in common.

#### About the Lesson

This TI-Nspire™ lesson allows students to use number line diagrams to represent collections of equivalent ratios by visually displaying the relative sizes of two or more different quantities. Double number lines can be used as tools to organize and solve problems involving ratios, particularly in representing ratios that involve fractions.

Prior to working on this lesson, students should understand:

• the concept of equivalent fractions;
• how to use number lines;
• the concept of unit rates

This is Lesson 7 out of 15 in the Building Concepts in Mathematics: Ratios and Proportional Relationships Series