aidemia--modules-lessonplan_request	Titles of parts of the lesson must be formatted as headings
What to create	Lesson plan
Which subject	Mathematics
What topic	Addition and subtraction within 20
What length (min)	30
What age group	Year or Grade 1
Include homework
Include images descriptions
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Lesson Plan: Addition and Subtraction within 20

Subject

Mathematics

Grade Level

1st Grade

Duration

30 Minutes

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Objectives

By the end of this lesson, students will be able to:

1. Perform addition and subtraction within 20.
2. Solve word problems involving addition and subtraction.
3. Demonstrate understanding of the relationship between addition and subtraction.

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Materials

• Whiteboard and markers
• Counting manipulatives (like blocks or counters)
• Addition and subtraction flashcards
• Worksheets for practice
• Story problem cards

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Lesson Outline

Introduction (5 Minutes)

1. Greeting: Welcome students and introduce the topic.
2. Warm-up Activity: Engage in a quick counting exercise. Count aloud from 1 to 20 as a class.

Direct Instruction (10 Minutes)

1. Explain Addition:

   • Define addition as "putting together."
   • Demonstrate with manipulatives (e.g., “If I have 3 blocks and I add 2 more, how many do I have?”).
   • Write a number sentence on the whiteboard (3 + 2 = 5).

2. Explain Subtraction:

   • Define subtraction as "taking away."
   • Use manipulatives to illustrate (e.g., “If I have 5 blocks and I take away 2, how many are left?”).
   • Write a number sentence on the whiteboard (5 - 2 = 3).

Guided Practice (10 Minutes)

1. Flashcards: Show addition and subtraction flashcards with problems (e.g., 4 + 3, 8 - 2).

   • Ask students to answer each problem and show with fingers or manipulatives.

2. Word Problems:

   • Present simple word problems to the class:
     • "Samantha has 7 apples. She buys 2 more. How many apples does she have now?"
     • "John had 10 balloons. 3 flew away. How many does he have left?"
   • Have students work in pairs to solve these problems using manipulatives.

Independent Practice (5 Minutes)

• Distribute worksheets with addition and subtraction problems and word problems.
• Allow students to work individually to complete them while providing assistance as needed.

Closure (5 Minutes)

1. Review: Recap the key concepts of addition and subtraction.
2. Class Sharing: Invite a few students to share their answers from the worksheets and discuss how they solved them.
3. Exit Ticket: Ask each student to solve one last addition or subtraction problem on a small piece of paper and hand it in as they leave.

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Assessment

• Observe student participation during guided practice.
• Review completed worksheets to assess understanding and accuracy of addition and subtraction.

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Adaptations

• For students who need extra help, provide one-on-one support using manipulatives.
• For advanced learners, introduce simple two-digit addition and subtraction problems using a number line.

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References

• Common Core Standards for Mathematics: 1.OA - Operations and Algebraic Thinking
• Teaching resources and manipulatives provided by [your school's resource center]

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This lesson plan focuses on making addition and subtraction engaging through hands-on activities, collaborative work, and practical applications, catering to the needs and abilities of 1st-grade students.