Lesson Plan for Year 3 - Mathematics - Addition and Subtraction (three-digit numbers)

### Year 3 Mathematics Lesson Plan: Addition and Subtraction (Three-Digit Numbers) #### Duration: 60 minutes #### Learning Objectives: 1. Understand the concept of addition and subtraction with three-digit numbers. 2. Perform addition and subtraction with three-digit numbers accurately. 3. Develop mental and written strategies to solve addition and subtraction problems. #### Materials Needed: - Whiteboard and markers - Number cards - Place value charts - Printed worksheets with addition and subtraction problems - Maths manipulatives (e.g., base-10 blocks) - Pencils and erasers #### Lesson Structure: ##### Introduction (10 minutes) 1. **Warm-Up Activity:** - Begin with a quick mental maths game to refresh students' memories of basic addition and subtraction facts. For example, use a number line to quickly solve single-digit addition and subtraction problems. - Ask students to volunteer a few quick answers on a whiteboard. 2. **Learning Intention:** - Explain that today we will be learning how to add and subtract three-digit numbers. - Write the learning intention on the whiteboard: "We are learning to add and subtract three-digit numbers." ##### Main Teaching Activities (30 minutes) 1. **Direct Instruction (10 minutes):** - Use the whiteboard to demonstrate the addition of two three-digit numbers (e.g., 243 + 165). - Break it down step-by-step, using place value charts and base-10 blocks if necessary. - Emphasize the importance of lining up numbers by their place value (units, tens, hundreds). - Repeat the process with subtraction, highlighting the concept of 'borrowing' or 'regrouping' if necessary (e.g., 523 - 178). 2. **Guided Practice (10 minutes):** - Distribute place value charts and base-10 blocks to students. Pair them up. - Give each pair a set of three-digit addition and subtraction problems to solve using their materials. - Circulate around the classroom to provide support and check for understanding. 3. **Independent Practice (10 minutes):** - Distribute printed worksheets with a series of three-digit addition and subtraction problems. - Instruct students to solve these problems independently using the strategies discussed. - Encourage students to check their work for accuracy. ##### Plenary (10 minutes) 1. **Review and Reflect:** - Ask a few students to share the strategies they used to solve their problems. - Discuss any common challenges and how they can be overcome. - Revisit the learning objective and check if it has been achieved. Pose questions like: "Can someone show how to add 342 and 158 on the whiteboard?" or "How would you solve 476 minus 239?" 2. **Extension Activity:** - For students who finish early or grasp the concept quickly, provide more challenging problems that involve multiple steps or incorporate word problems. ##### Conclusion (5 minutes) 1. **Recap:** - Summarize the key points of the lesson. - Remind students why it's important to line up numbers correctly by their place value. 2. **Homework:** - Assign a few additional problems for homework to reinforce the day's learning. - Encourage students to explain their solving process to a family member. ##### Assessment: - During guided practice, observe and take notes on student participation and problem-solving strategies. - Collect and review the independent practice worksheets to check for understanding and accuracy. - Use the plenary discussion to assess comprehension and address any remaining issues. --- This lesson plan aims to combine direct teaching with hands-on activities to enhance the understanding of addition and subtraction of three-digit numbers. It also incorporates different learning methods to cater to diverse student needs.