Lesson Title: Subtraction to 20

Learning Intention: To understand and practice subtraction within 20.

Success Criteria: - Students will be able to subtract numbers within 20 accurately. - Students will be able to explain their subtraction strategies. - Students will be able to solve word problems involving subtraction.

Introduction: Begin the lesson by reviewing addition and discussing how subtraction is the opposite of addition. Introduce the concept of subtraction within 20 and explain that we will be practicing different strategies to subtract numbers.

Main Part of the Lesson: 1. Share new knowledge: Teach different subtraction strategies such as counting back, using a number line, and using manipulatives. 2. Stimulate discussion: Ask students to share their own subtraction strategies and discuss which strategies work best for different situations. 3. Activity: Provide students with subtraction worksheets and manipulatives to practice subtracting numbers within 20. Encourage students to use different strategies and explain their thinking.

Plenary: Review the lesson by asking students to share their favorite subtraction strategy and explain why they prefer it. Discuss any challenges students faced during the activity and provide additional support if needed.

Differentiation: - Provide visual aids and manipulatives for students who may need extra support. - Offer challenge questions for students who grasp the concept quickly. - Pair students up for peer support during the activity.

Assessment Strategies: - Observe students during the activity to assess their understanding of subtraction strategies. - Use exit tickets to assess individual student understanding. - Review student work on the subtraction worksheets to assess accuracy and strategy use.

Higher Order Thinking Questions: 1. How can you use subtraction to solve real-life problems? (Analyzing) 2. Can you explain why counting back is an effective subtraction strategy? (Evaluating) 3. How would you teach a friend who is struggling with subtraction within 20? (Creating)