Lesson Plan: Addition and Subtraction within 1000

Subject: Mathematics Topic: Number, Money, and Measure Grade Level: First Level (Scottish Curriculum)

Desired Outcome: I can use addition, subtraction, multiplication, and division when solving problems, making the best use of the mental strategies and written skills I have developed.

Lesson Duration: 60 minutes

Resources: - Whiteboard or blackboard - Markers or chalk - Worksheets with addition and subtraction problems within 1000 - Counters or manipulatives (optional)

Introduction (5 minutes): 1. Begin the lesson by reviewing the concepts of addition and subtraction. 2. Ask the students to share examples of real-life situations where addition and subtraction are used. 3. Explain that today’s lesson will focus on addition and subtraction within 1000.

Development (40 minutes): 1. Mental Strategies for Addition and Subtraction (15 minutes): a. Teach mental strategies for addition: - Adding tens and ones separately (e.g., 30 + 40 = 70) - Adding tens first and then ones (e.g., 30 + 40 = 70) b. Practice mental addition problems together as a class. c. Repeat the process for mental subtraction strategies: - Subtracting tens and ones separately (e.g., 70 - 30 = 40) - Subtracting tens first and then ones (e.g., 70 - 30 = 40) d. Practice mental subtraction problems together as a class.

1. Written Skills for Addition and Subtraction (15 minutes): a. Introduce the written methods for addition and subtraction within 1000. b. Model the process of adding and subtracting two-digit numbers using the column method. c. Provide guided practice examples on the board, allowing students to solve them independently. d. Circulate the classroom to provide support and feedback as students work on the problems.

2. Problem-Solving Activities (10 minutes): a. Distribute worksheets with addition and subtraction problems within 1000. b. Instruct students to solve the problems independently, using mental strategies or written methods. c. Encourage students to show their work and explain their thinking. d. Collect the worksheets for assessment purposes.

Conclusion (5 minutes): 1. Review the mental strategies and written methods for addition and subtraction within 1000. 2. Ask students to share any challenges they faced during the problem-solving activities. 3. Summarize the importance of using mental strategies and written skills when solving mathematical problems. 4. Provide positive feedback and reinforce the desired outcome.

Extension Activity (Optional): 1. Divide the class into small groups. 2. Provide each group with a set of counters or manipulatives. 3. Instruct the groups to create their own addition and subtraction problems within 1000 using the manipulatives. 4. Encourage the groups to solve each other’s problems and explain their thinking.

Assessment: - Observe students’ participation and engagement during class discussions and activities. - Review students’ completed worksheets for accuracy and understanding of addition and subtraction within 1000. - Provide feedback and support to students who may require additional assistance.