Module 2: Subtraction StrategiesMath 2A  Course Guide
Module Overview:
In this module, students will define the meaning of subtraction, solve simple subtraction sentences, and identify missing parts of a subtraction sentence. Students will define the countingback subtraction strategy and solve subtraction sentences using the countingback strategy. They will identify doubles to subtract and solve doubles subtraction facts using Unifix cubes and/or drawings. Students will define the parts and whole of addition and subtraction sentences, identify similarities between addition and subtraction sentences, identify the parts of a subtraction sentence and write subtraction sentences to represent pictures.
Module Materials:
Lesson #  Lesson Title  Material(s) 

1  Subtraction Properties  A bag of colored candies (M&M’s or Skittles) or counters; 
2  Count Back to Subtract  Counters; 
3  Use Doubles to Subtract  Dominoes with equal sides totalling 4, 6, 8, 10, 12; 20 Unifix cubes; 
4  Relate Addition and Subtraction  Counters; 
5  Write Subtraction Sentences  Counters, Crayons; 
Module Objectives:
Lesson #  Lesson Title  Objective(s) 

1  Subtraction Properties 

2  Count Back to Subtract 

3  Use Doubles to Subtract 

4  Relate Addition and Subtraction 

5  Write Subtraction Sentences 

Module Key Words:
Key Words 

Part Whole Subtract Subtraction Equation Take away Difference Countingback strategy Doubles Parts Addition sentence Subtraction sentence 
Module Assignments:
Lesson #  Lesson Title  Page #  Assignment Title 

1  Subtraction Properties  4  It’s Your Turn! 
1  Subtraction Properties  5  Write It Out! 
2  Count Back to Subtract  4  It’s Your Turn! 
2  Count Back to Subtract  5  Write It Out! 
3  Use Doubles to Subtract  5  It’s Your Turn! 
4  Relate Addition and Subtraction  4  It’s Your Turn! 
4  Relate Addition and Subtraction  5  Write it Out! 
5  Write Subtraction Sentences  4  It’s Your Turn! 
5  Write Subtraction Sentences  5  Write It Out! 
Learning Coach Notes:
Lesson #  Lesson Title  Notes 

1  Subtraction Properties  In their Math notebook, have your student explain what the difference is in a subtraction problem. 
2  Count Back to Subtract  Ask your student to describe to you how to count back when subtracting. 
3  Use Doubles to Subtract  Ask your student to explain how they can use doubles to help them subtract. 
4  Relate Addition and Subtraction  In their Math Notebook, have your student explain what a fact family is and write down an example of a fact family. 
5  Write Subtraction Sentences  In their Math notebook, have your student write and label the parts of a subtraction sentence. 
Module Guiding Questions:
When a student starts a lesson ask them questions to check for prior knowledge and understanding and to review concepts being taught. At the end of the lesson ask the questions again to see if their answer changes.
Lesson Title  Question 

Subtraction Properties 

Count Back to Subtract 

Use Doubles to Subtract 

Relate Addition and Subtraction 

Write Subtraction Sentences 

Module Video Questions:
When a student watches a video take time to ask them questions about what they watched. Suggested questions for the videos in this module are listed here. Suggestion: Have the student watch the entire video first all the way through. Then have them watch the video a second time, as they watch it pause the video and ask the questions.
Lesson Title  Video  Question 

Use Doubles to Subtract  Use Doubles to Subtract 

Relate Addition and Subtraction  Relate Addition and Subtraction 

Write Subtraction Sentences  Write Subtraction Sentences 

Module Suggested Read Aloud Books:
Take time to read to your student or have them read aloud to you. Read a different book each day. While reading the book point out concepts being taught. You may purchase these books or find them at your local library. Suggested things to discuss while reading the book:
 What is the main idea?
 What are three things new you learned?
 How does this book relate to what you are learning about?
#  Book  Author  Lexile Level 

Module Outing:
Take some time to apply what your student is learning to the real world. Suggested outings are below.
#  Outing 
