# Chapter 3: Addition and Subtraction of Decimals

**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 third chapter, Adding and Subtracting Decimals, students will engage in many Concepts including decimal place value, reading and writing decimals, decimal money amounts, metric measurement, sums and differences of decimals, stem-and-leaf plots and estimation.

- 3.1.
## Numbers with Decimal Place Value

- 3.2.
## Numbers in Expanded Form

- 3.3.
## Decimals in Words

- 3.4.
## Combinations of Decimal Money Amounts

- 3.5.
## Equivalent Metric Units of Length

- 3.6.
## Metric Unit Length Conversions

- 3.7.
## Appropriate Tools for Metric Measurement

- 3.8.
## Appropriate Decimal Units for Metric Measurement

- 3.9.
## Metric Length Comparison

- 3.10.
## Decimal Comparison

- 3.11.
## Decimal Rounding on a Number Line

- 3.12.
## Decimal Rounding Given Place Value

- 3.13.
## Small Decimal Rounding to a Leading Digit

- 3.14.
## Large Decimal Rounding to Decimal Representations

- 3.15.
## Decimal Rounding to Estimate Sums and Differences

- 3.16.
## Front-End Estimation

- 3.17.
## Decimal Addition

- 3.18.
## Decimal Subtraction

- 3.19.
## Mental Math to Add and Subtract Decimals

- 3.20.
## Properties in Decimal Operations

- 3.21.
## Stem-and-Leaf Plots

- 3.22.
## Stem-and-Leaf Plots, Range of a Data Set

- 3.23.
## Stem-and-Leaf Plots, Mean, Median and Mode

- 3.24.
## Problem Solving Plan, Estimation with Decimals

### Chapter Summary

## Summary

Having completed this chapter, students are now ready to move on to Chapter Four. Each Concept has provided students with an opportunity to engage and practice skills in many Concepts including decimal place value, reading and writing decimals, decimal money amounts, metric measurement, sums and differences of decimals, stem-and-leaf plots and estimation.