My Math Chapter 5: Add and Subtract Decimals

In Progress - Updated 8-12-19

​In this chapter, students will add and subtract decimals to solve real-world problems.

Chapter 5 Objectives:

• Model addition and subtraction of decimals using base-10 blocks and 100ths squares
• Round decimals
• Estimate sums and differences of decimals
• Apply the commutative and associative properties of addition to solve problems
• Use an algorithm to add and subtract decimals in a variety of contexts
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​Login to the McGraw-Hill My Math web site to access more information about this chapter, including visual vocabulary cards, an interactive journal, homework pages, video tutorials, and much more. Please contact Mr. Bowen if you do not know your username/password.

Chapter 5 Downloads

• Chapter 5 My Homework Answer Keys
• Chapter 5 Review Answer Key​

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Chapter 5 Lesson Resources

Listed below are chapter lessons from the McGraw-Hill My Math text. Please note that these lessons may be modified, rearranged, or omitted. Supplemental lessons will be added as needed.
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Lesson 1: Rounding Decimals
Downloads​

• Homework 5-1 Answer Key

Video Tutorials

• Rounding (Mr. Bowen)
• Rounding Decimals (Khan Academy)
• Rounding Decimals (LearnZillion)
• Round Decimals (MrMathBlog)

Games and Interactives​

• Hotel Decimalfornia Game​
• Rounding Numbers (Geogebra Interactive)

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Lesson 2: Estimate Sums and Differences
Downloads​

• Homework 5-2 Answer Key

​Video Tutorials​

• Estimating Sums - old version (Mr. Bowen)
• Estimating Decimal Sums (Khan Academy)
• Estimating Decimal Differences (Khan Academy)
• Estimate Decimal Sums and Differences (MrMathBlog)

Games and Interactives

• Sum Sense Addition Game
• ​Sum Sense Subtraction Game
• Math Man Estimate Sums
• Math Man Estimate Differences

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Lesson 3: Problem-Solving Investigation: Estimate or Exact Answer
Downloads

• Homework 5-3 Answer Key

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Lesson 4: Hands-On: Add Decimals Using Base Ten Blocks
Downloads

• Homework 5-4 Answer Key

Video Tutorials

• Add Decimals with Base Ten Blocks (LearnZillion)
• Decimal Addition with Base Ten Blocks (MrMathBlog)
• ​Adding 3-Digit Numbers (Khan Academy)
• How Carrying Works​​ (Khan Academy)

​Games and Interactives

• Add Like Mad​​

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Lesson 5: Hands-On: Add Decimals Using Models
Downloads

• Homework 5-5 Answer Key

Video Tutorials

• ​Addition and Subtraction with Decimal Squares (Mr. Bowen)

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Lesson 6: Add Decimals
Downloads

• Homework 5-6 Answer Key

Video Tutorials

• Add and Subtract Decimals (Mr. Bowen)
• Adding Decimals 1 (Khan Academy)
• Adding Decimals 2 (Khan Academy)
• Adding Decimals 3 (Khan Academy)
• Adding Decimals Word Problem (Khan Academy)​​
• Add Decimals (MrMathBlog)

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Lesson 7: Addition Properties
Downloads

• Homework 5-7 Answer Key

​Video Tutorials

• Commutative and Associative Properties (Mr. Bowen)
• Commutative Law of Addition (Khan Academy)
• Associative Law of Addition (Khan Academy)

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Lesson 8: Hands-On: Subtract Decimals Using Base Ten Blocks
Downloads​

• Homework 5-8 Answer Key

Video Tutorials

• Subtract Decimals with Base Ten Blocks (LearnZillion)
• Decimal Subtraction with Base Ten Blocks (MrMathBlog)
• Subtracting with Regrouping 1 (Khan Academy)
• Subtracting with Regrouping 2 (Khan Academy)
• Subtracting with Regrouping Twice (Khan Academy)
• Subtraction with Zeros (Khan Academy)
• Subtraction World Problem​ (Khan Academy)

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Lesson 9: Hands-On: Add Decimals Using Models
Downloads

• Homework 5-9 Answer Key

​​Video Tutorials

• ​Addition and Subtraction with Decimal Squares (Mr. Bowen)

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Lesson 10: Subtract Decimals
Downloads

• Homework 5-10 Answer Key

Video Tutorials​

• Add and Subtract Decimals (Mr. Bowen)
• Subtracting Decimals 1 (Khan Academy)
• Subtracting Decimals 2 (Khan Academy)
• Subtracting Decimals Word Problem (Khan Academy)​
• Subtract Decimals (MrMathBlog)

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OK Supplemental Lesson: Add and Subtract Money
Downloads
​​Video Tutorials

• Problem Solving: Add and Subtract Money (MrMathBlog)

​Games and Interactives​​

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OK Supplemental Lesson:
Downloads
​​Video Tutorials 
​Games and Interactives​​

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OK Supplemental Lesson:
Downloads
​​Video Tutorials 
​Games and Interactives​​

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