# Activities

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• • ##### Author 6-8

• ##### Device
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• TI-Nspire™ Apps for iPad®
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

3.9

## Connecting Ratios and Scaling

#### 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

In this TI-Nspire™ lesson, students investigate ratios and scale factor. Ratios are connected to geometry in several ways. One figure can be scaled from another by using a scale factor, making the figure larger or smaller depending on whether the factor is larger or smaller than 1. If the scale factor is k, then each linear measure x will become kx.

Prior to working on this lesson, students should understand:

• Be able to write equations to describe proportional relationships

This is Lesson 14 out of 15 in the Building Concepts in Mathematics: Ratios and Proportional Relationships Series