Lesson Plan for Grade 4 - Mathematics - Addition and Subtraction (four-digit numbers)

### Lesson Plan: Addition and Subtraction of Four-Digit Numbers #### Grade: 4 #### Subject: Mathematics #### Topic: Addition and Subtraction (Four-Digit Numbers) #### Duration: 1 Hour --- ### Objectives: - Students will understand how to add and subtract four-digit numbers with and without regrouping. - Students will improve their problem-solving skills and ability to check their work. - Students will apply addition and subtraction skills to solve practical problems. ### Materials Needed: - Whiteboard and markers - Projector and computer or printed worksheets - Number cards - Base-ten blocks or place value charts - Student notebooks and pencils - Erasers ### Standards: Align with Common Core State Standards (CCSS) for Mathematics: - CCSS.MATH.CONTENT.4.NBT.B.4 - Perform multi-digit arithmetic. --- ### Introduction (10 minutes): 1. **Greetings and Warm-Up Activity:** - Begin with a quick mental math warm-up to get students thinking about numbers. For example: “What’s 50+30?” or “What’s 100-35?” 2. **Objective Sharing:** - Clearly state the objectives of the lesson: "Today, we will learn how to add and subtract four-digit numbers with and without regrouping. By the end of the lesson, you will be able to solve problems involving large numbers and check your work accurately." --- ### Instructional Input (15 minutes): 1. **Addition with Four-Digit Numbers:** - Demonstrate adding two four-digit numbers on the whiteboard, showing the step-by-step process. - Example: ``` 2345 + 5678 ------ ``` - Discuss the importance of aligning numbers by place value (ones, tens, hundreds, thousands). - Emphasize the concept of regrouping (carrying over) when sums exceed 9. 2. **Subtraction with Four-Digit Numbers:** - Demonstrate subtracting one four-digit number from another. - Example: ``` 6789 - 2345 ------ ``` - Explain how to borrow from the next place value when needed. 3. **Use of Visual Aids:** - Utilize base-ten blocks or place value charts to visually represent the addition and subtraction process. --- ### Guided Practice (15 minutes): 1. **Interactive Whiteboard Activity:** - Solve a few examples together as a class. Call on different students to come up and contribute to the solution process. - Example Problems: - Addition: 4123 + 2567 - Subtraction: 6543 - 3210 2. **Pair Activity:** - Have students pair up and provide each pair with several problems to solve together. Walk around the classroom to offer assistance and ensure students are following the correct steps. - Encourage pairs to check each other’s work. --- ### Independent Practice (10 minutes): 1. **Worksheet:** - Hand out worksheets with a mix of addition and subtraction problems involving four-digit numbers. - Examples on the worksheet: - 3456 + 2897 - 5067 - 1345 - Ask students to work independently and show all their work. --- ### Closing (10 minutes): 1. **Review and Recap:** - Review the problems on the worksheet with the class, discussing common mistakes and how to correct them. - Recap the key points from the lesson: - Aligning numbers by place value. - Regrouping in addition and borrowing in subtraction. 2. **Exit Ticket:** - Provide a simple problem for students to solve as an exit ticket to quickly assess their understanding before they leave. - Example: - Add: 5278 + 3491 - Subtract: 8076 - 2564 --- ### Assessment: - Monitor student participation and understanding during the guided practice. - Evaluate the worksheets for accuracy and understanding of the concepts. - Review exit tickets to gauge individual student comprehension. --- ### Differentiation: - **For Advanced Learners:** - Provide more challenging problems that involve multiple regrouping steps. - **For Struggling Learners:** - Offer additional visual aids and step-by-step checklists. Pair these students with a peer mentor for support. --- ### Homework: - Assign a few additional problems for practice to reinforce the day’s lesson. By following this lesson plan, students will gain a solid understanding of adding and subtracting four-digit numbers, equipping them with essential arithmetic skills for future mathematical concepts.