Module 11: Two-Digit Mental Math Addition Strategies-Math 2A - Course Guide

Module Overview:

In this module, students will use fact families to add numbers, use mental math to solve two-digit addition and break apart numbers to add two-digit addends. They will break apart numbers to add two-digit addition and use the next-ten strategy to add bigger numbers mentally.

Module Materials:

Lesson # Lesson Title Material(s)
1 Two-Digit Fact Families None
2 Mentally Add Two-Digit Numbers Scissors;
3 Add in Parts Scissors;
4 Apply the Add-in-Parts Strategy None
5 The Next Ten None

Module Objectives:

Lesson # Lesson Title Objective(s)
1 Two-Digit Fact Families
  1. Use fact families to add numbers
2 Mentally Add Two-Digit Numbers
  1. Use mental math to solve two-digit addition
3 Add in Parts
  1. Break apart numbers to add two-digit addends
4 Apply the Add-in-Parts Strategy
  1. Break apart numbers to add two-digit addition
5 The Next Ten
  1. Use the next-ten strategy to add bigger numbers mentally

Module Key Words:

Key Words
Fact family
Fact-family triangle
Whole ten
Non-whole ten
Mental math
Next ten
Skip count

Module Assignments:

Lesson # Lesson Title Page # Assignment Title
1 Two-Digit Fact Families 4 Hands-On
2 Mentally Add Two-Digit Numbers 4 Hands-On
3 Add in Parts 4 Hands-On
4 Apply the Add-in-Parts Strategy 4 Hands-On

Learning Coach Notes:

Lesson # Lesson Title Notes
1 Two-Digit Fact Families Ask your student to explain how fact families can help them add.
2 Mentally Add Two-Digit Numbers Ask your student to explain how to add numbers using mental math.
3 Add in Parts Ask your student to demonstrate adding two-digit numbers using the Add In Parts Strategy this learned in this lesson.
4 Apply the Add-in-Parts Strategy Ask your student to explain why Mental Math strategies are helpful.
5 The Next Ten Ask your student to explain the next-ten 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
Two-Digit Fact Families
  1. Why is it helpful to use fact families?
Mentally Add Two-Digit Numbers
  1. How do we add whole tens?
Add in Parts
  1. What is the Add in Parts Strategy?
Apply the Add-in-Parts Strategy
  1. Why is it helpful to add in parts?
The Next Ten
  1. What is the next-ten strategy for adding numbers?

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