aidemia--modules-lessonplan_request	Titles of parts of the lesson must be formatted as headings
What to create	Lesson plan
Which subject	Mathematics
What topic	Three digit addition and subtraction
What length (min)	30
What age group	Year or Grade 3
Include homework
Include images descriptions
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Mathematics Lesson Plan: Three-Digit Addition and Subtraction

Grade Level

Grade 3

Duration

30 Minutes

Objectives

By the end of this lesson, students will be able to:

• Solve three-digit addition problems.
• Solve three-digit subtraction problems.
• Apply strategies to check their work.

Materials Needed

• Whiteboard and markers
• Worksheets with three-digit addition and subtraction problems
• Base ten blocks or place value charts (optional)
• Pencils and erasers

Introduction (5 Minutes)

1. Begin the lesson by asking students if they can recall how to add and subtract two-digit numbers.
2. Briefly review the concepts of place value, highlighting the hundreds, tens, and units.
3. Introduce the lesson topic of three-digit addition and subtraction and explain its importance in everyday life.

Direct Instruction (10 Minutes)

1. Addition

   • Write a three-digit addition problem on the board (e.g., 257 + 486).
   • Demonstrate how to line up numbers by place value and add starting from the rightmost digit.
   • Show carrying if necessary (e.g., if the sum of the units exceeds 10).
   • Solve the problem step by step with student participation.

2. Subtraction

   • Write a three-digit subtraction problem on the board (e.g., 732 - 448).
   • Explain how to borrow if the top number is smaller than the bottom number for any place value, starting from the right.
   • Solve the problem step by step with student engagement.

Guided Practice (10 Minutes)

1. Distribute a worksheet that contains a mix of three-digit addition and subtraction problems.
2. The class will solve one of each problem together as a group:
   • Addition Example: 364 + 279
   • Subtraction Example: 815 - 296
3. Allow students to work individually or in pairs on the remaining problems while circulating the room to assist those who need help.

Independent Practice (5 Minutes)

1. Ask students to complete a couple of additional three-digit addition and subtraction problems on their own.
2. Reinforce that they can check their work by reversing the operation (e.g., checking addition with subtraction).

Conclusion (5 Minutes)

1. Review key concepts of three-digit addition and subtraction with the class.
2. Discuss some strategies students used to solve problems or check their work.
3. Reinforce the importance of accuracy in their calculations.

Homework

Students are to complete the following problems at home:

1. Addition Problems

   • a) 576 + 289 = ____
   • b) 432 + 345 = ____

2. Subtraction Problems

   • c) 854 - 276 = ____
   • d) 619 - 472 = ____

Homework Answers

1. Addition

   • a) 576 + 289 = 865
   • b) 432 + 345 = 777

2. Subtraction

   • c) 854 - 276 = 578
   • d) 619 - 472 = 147

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This lesson plan provides a structured approach to teaching third graders about three-digit addition and subtraction, keeping them engaged and ensuring they have the necessary resources to practice new skills.