# Chapter 9: CK-12 Algebra Explorations Concepts, Grade 7

**At Grade**Created by: CK-12

## Introduction

In these concepts, you will continue to develop eight key concepts of algebra and will practice your problem solving skills. There are eight concepts, and each one focuses on a key algebraic thinking strategy. You will focus on describing, identifying your job, planning, solving, and checking your thinking.

## Chapter Outline

- 9.1. X for Unknown
- 9.2. Letter Grids
- 9.3. Hanging Scales 7
- 9.4. Speedo
- 9.5. Lines of Numbers
- 9.6. Fruit Confusion
- 9.7. Yummy Yogurt
- 9.8. Pedal Power

### Chapter Summary

## Summary

In these concepts we used proportional reasoning when we determined the weights and costs of fruits, when we applied the