Grade 4 Lesson Plan: Adding and Subtracting Four-Digit Numbers

Objective: Students will be able to add and subtract four-digit numbers accurately and efficiently.

Materials: - Whiteboard or chart paper - Markers or chalk - Four-digit number cards (prepared in advance) - Pencils - Worksheets for guided and independent practice - Manipulatives (optional)

Engagement (10 minutes): 1. Begin the lesson by asking students to share any experiences they have had with adding or subtracting large numbers. 2. Show students a four-digit number on the board (e.g., 3,456) and ask them to discuss with a partner what they notice about the number. 3. Invite a few students to share their observations with the class. 4. Introduce the concept of adding and subtracting four-digit numbers, explaining that it is similar to adding and subtracting smaller numbers, but with more digits. 5. Ask students to brainstorm strategies they could use to add or subtract four-digit numbers.

Instruction (15 minutes): 1. Write a four-digit addition problem on the board (e.g., 2,345 + 1,234) and model the process of adding the numbers step by step. 2. Emphasize the importance of aligning the digits correctly and carrying over when necessary. 3. Repeat the process with a few more addition problems, gradually increasing the complexity. 4. Write a four-digit subtraction problem on the board (e.g., 4,567 - 2,345) and model the process of subtracting the numbers step by step. 5. Emphasize the importance of borrowing when necessary and aligning the digits correctly. 6. Repeat the process with a few more subtraction problems, gradually increasing the complexity.

Guided Practice (15 minutes): 1. Divide the class into small groups and distribute the four-digit number cards. 2. Give each group a whiteboard or chart paper and markers/chalk. 3. Call out addition or subtraction problems involving four-digit numbers, and have the groups work together to solve them. 4. Circulate around the room, providing guidance and support as needed. 5. After each problem, ask a different group to share their solution and explain their thinking.

Independent Practice (15 minutes): 1. Distribute worksheets with a variety of addition and subtraction problems involving four-digit numbers. 2. Instruct students to complete the problems independently. 3. Encourage them to use the strategies discussed during the instruction and guided practice. 4. Collect the worksheets for assessment.

Questioning (10 minutes): 1. Ask students questions to check their understanding and promote critical thinking, such as: - How do you know when to carry over or borrow in addition/subtraction? - Can you explain why aligning the digits correctly is important? - What strategies did you use to solve the problems? - Can you think of a real-life situation where adding or subtracting four-digit numbers would be useful?

Assessment (10 minutes): 1. Review the completed worksheets to assess students’ understanding of adding and subtracting four-digit numbers. 2. Look for accuracy, efficiency, and the use of appropriate strategies. 3. Provide feedback to students, highlighting their strengths and areas for improvement.

Extension (10 minutes): 1. For students who demonstrate proficiency, provide extension activities such as: - Creating their own four-digit addition and subtraction problems for a partner to solve. - Exploring word problems involving four-digit numbers and solving them. - Using manipulatives (e.g., base-ten blocks) to represent and solve four-digit addition and subtraction problems.

Note: The duration of each section can be adjusted based on the needs and pace of the students.