Module 11: TwoDigit Mental Math Addition StrategiesMath 2A  Course Guide
Module Overview:
In this module, students will use fact families to add numbers, use mental math to solve twodigit addition and break apart numbers to add twodigit addends. They will break apart numbers to add twodigit addition and use the nextten strategy to add bigger numbers mentally.
Module Materials:
Lesson #  Lesson Title  Material(s) 

1  TwoDigit Fact Families  None 
2  Mentally Add TwoDigit Numbers  Scissors; 
3  Add in Parts  Scissors; 
4  Apply the AddinParts Strategy  None 
5  The Next Ten  None 
Module Objectives:
Lesson #  Lesson Title  Objective(s) 

1  TwoDigit Fact Families 

2  Mentally Add TwoDigit Numbers 

3  Add in Parts 

4  Apply the AddinParts Strategy 

5  The Next Ten 

Module Key Words:
Key Words 

Fact family Factfamily triangle Whole ten Nonwhole ten Mental math Next ten Skip count 
Module Assignments:
Lesson #  Lesson Title  Page #  Assignment Title 

1  TwoDigit Fact Families  4  HandsOn 
2  Mentally Add TwoDigit Numbers  4  HandsOn 
3  Add in Parts  4  HandsOn 
4  Apply the AddinParts Strategy  4  HandsOn 
Learning Coach Notes:
Lesson #  Lesson Title  Notes 

1  TwoDigit Fact Families  Ask your student to explain how fact families can help them add. 
2  Mentally Add TwoDigit Numbers  Ask your student to explain how to add numbers using mental math. 
3  Add in Parts  Ask your student to demonstrate adding twodigit numbers using the Add In Parts Strategy this learned in this lesson. 
4  Apply the AddinParts Strategy  Ask your student to explain why Mental Math strategies are helpful. 
5  The Next Ten  Ask your student to explain the nextten strategy for addition. 
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 

TwoDigit Fact Families 

Mentally Add TwoDigit Numbers 

Add in Parts 

Apply the AddinParts Strategy 

The Next Ten 

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 

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 
