Lesson Plan:

# Double Trouble: Subtraction Practice

4.7 based on 3 ratings
August 27, 2015
Standards
August 27, 2015

## Learning Objectives

Students will be able to accurately subtract two digit problems with regrouping.

## Lesson

### Introduction (5 minutes)

• Use a real life situation that students are familiar with to explain regrouping. For example, if studentsâ€™ desks are organized in rows, ask: I need 8 students to help me deliver items to other classrooms, but I only have 6 students seated in a row. How can I solve that problem?
• Explain that subtraction with regrouping is very similar, where part of the next row must be moved to the first row to have what is needed.

### Explicit Instruction/Teacher Modeling (5 minutes)

• Pair students up.
• Explain to students that they will be working with subtraction, but these problems will require decomposing, or breaking big numbers into smaller numbers, or regrouping, which is rearranging numbers.

### Guided Practice/Interactive Modeling (10 minutes)

• Provide some sample subtraction with regrouping problems on the dry erase board.
• Have students show their work on paper with the necessary manipulatives they have for support.
• Instruct your students to explain to the class the need for certain steps as the problems are being worked out.
• Sample problems should be tailored to fit the level of the students. For example, easier problems could include 44-37, 25-19, and 31-26, medium level problems could include 44-27, 75-39, and 61-18, difficult problems could include 125-19, 144-27, and 161-18, and advanced problems could include 125-119, 144-127, and 161-118.

### Independent Working Time (15 minutes)

• Pass out the game sheets (Math Go Round) and the necessary materials.
• Review the rules on the game sheets with the students.
• Monitor the students as they play, and provide support as needed.

## Extend

### Differentiation

• Enrichment: Assign a game sheet at a more challenging level.
• Support: Write problems in a place value chart for students. Give students manipulatives to help them see physical evidence of subtraction.

## Review

### Assessment (5 minutes)

• Have each student pick out a domino and draw the dots from the domino on the assessment.
• Direct your students to write a subtraction problem using the numbers given and solve this problem.
• Ask your students to check this problem.

### Review and Closing (5 minutes)

• Have a discussion with your students. Potential guiding questions include: What does it mean to decompose? When would you need to decompose? When would you not need to decompose?
• Instruct your students to create illustrations on the board to help them in their explanations.