# Chapter 1: Number Sense and Variable Expressions

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

## Introduction

In Math 6, the learning content is divided into Concepts. Each Concept is complete and whole providing focused learning on an indicated objective. Theme-based Concepts provide students with experiences that integrate the content of each Concept. Students are given opportunities to practice the skills of each Concept through real-world situations, examples, guided practice and independent practice sections. In this first chapter, Number Sense and Variable Expressions, students will engage in the following Concepts: whole number operations, estimation, powers, bases and exponents, numerical expressions, the order of operations and problem solving plans and strategies.

- 1.1.
## Whole Number Addition

- 1.2.
## Whole Number Subtraction

- 1.3.
## Whole Number Multiplication

- 1.4.
## Whole Number Division

- 1.5.
## Estimation of Whole Number Addition and Subtraction

- 1.6.
## Estimation of Whole Number Multiplication and Division

- 1.7.
## Whole Number Exponents

- 1.8.
## Values Written as Powers

- 1.9.
## Evaluation and Comparison of Powers

- 1.10.
## Numerical Expression Evaluation with Basic Operations

- 1.11.
## Numerical Expression Evaluation with Grouping Symbols

- 1.12.
## Numerical Expression Evaluation

- 1.13.
## Single Variable Expressions

- 1.14.
## Expressions with One or More Variables

- 1.15.
## Words that Describe Patterns

- 1.16.
## Problem-Solving Models

- 1.17.
## Guess and Check, Work Backward

- 1.18.
## Problem Solving Plan, Mental Math

### Chapter Summary

## Summary

Having completed this chapter, students are now ready to move on to Chapter Two. Each Concept has provided students with an opportunity to engage and practice skills in many Concepts including whole number operations, estimation, powers, bases and exponents, numerical expressions, the order of operations and problem solving plans and strategies.