# Module 13: Subtract 2-Digit Numbers-Math 2A - Course Guide

## Module Overview:

In this module, students will subtract tens to subtract two-digit numbers, subtract tens and ones using a place value chart, and use the count-back strategy to subtract on a number line. They will use ten frames to subtract a one-digit number from a two-digit number and write and solve a two-digit subtraction sentence from a picture.

## Module Materials:

Lesson # Lesson Title Material(s)
1 Subtract Tens stacking blocks
crayons or colored pencils
pen or pencil
2 Subtract Tens and Ones stacking blocks
crayons or colored pencils
pen or pencil
3 Subtract from a Two-Digit Number Using a Number Line crayons or colored pencils
pen or pencil
scissors
4 Subtract a One-Digit Number from a Two-Digit Number crayons or colored pencils
pen or pencil
5 Problem-Solving Strategy: Write a Subtraction Sentence crayons or colored pencils
pen or pencil

Module Objectives:

Lesson # Lesson Title Objective(s)
1 Subtract Tens
1. Subtract tens to subtract two-digit numbers
2 Subtract Tens and Ones
1. Subtract tens and ones using a place value chart
3 Subtract from a Two-Digit Number Using a Number Line
1. Use the count-back strategy to subtract on a number line
4 Subtract a One-Digit Number from a Two-Digit Number
1. Use ten frames to subtract a one-digit number from a two-digit number
5 Problem-Solving Strategy: Write a Subtraction Sentence
1. Write and solve a two-digit subtraction sentence from a picture

Module Key Words:

Key Words
Whole tens
Skip count
Hundred chart
Whole
Part
Place-value chart
Digit
Count back
Number line
Ten frame
Subtraction sentence
Difference
Subtraction strategy

Module Assignments:

Lesson # Lesson Title Page # Assignment Title
1 Subtract Tens 4 Hands-On
2 Subtract Tens and Ones 4 It’s Your Turn!
3 Subtract from a Two-Digit Number Using a Number Line 4 Hands-On
4 Subtract a One-Digit Number from a Two-Digit Number 4 Hands-On
5 Problem-Solving Strategy: Write a Subtraction Sentence 4 Hands-On

None

## 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
Subtract Tens
1. How do you use place value to subtract two-digit numbers?
Subtract Tens and Ones
1. How can you use a place value chart to help you subtract?
Subtract from a Two-Digit Number Using a Number Line
1. What is the count-back strategy of subtraction?
Subtract a One-Digit Number from a Two-Digit Number
1. How can you subtract using ten frames?
Problem-Solving Strategy: Write a Subtraction Sentence
1. How do you write a subtraction sentence?

## 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