# 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.

- 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 \begin{align*}D=rt\end{align*}

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