Building Addition Confidence

Grade

1st Grade

Duration

60 minutes

Class Size

25 students

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Objective(s)

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

• CCSS.MATH.CONTENT.1.OA.A.1: Use addition within 20 to solve word problems involving adding to, putting together, and adding more, using objects, drawings, and equations with a symbol for the unknown number.
• CCSS.MATH.CONTENT.1.NBT.B.2: Understand that the two digits of a two-digit number represent amounts of tens and ones.
• Develop fluency in counting and addition strategies within 10 and 20.
• Demonstrate number sense by manipulating physical objects and visual aids to perform addition.
• Use multiple counting strategies such as counting on, making ten, and combining groups to add amounts confidently.
• Build confidence in addition before the formal introduction of subtraction.

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Materials Needed

• Counting manipulatives (e.g., counters, blocks, or plastic animals) – 25 sets
• Number cards (numbers 0-20)
• Large addition mat or whiteboard with addition sentence outlines
• Visual addition charts (showing sums up to 20)
• Dice (1-2 per group)
• Sticky notes and markers for group work
• Interactive addition games prepared on tablets or printable board games
• Large print number lines (0-20) for each student
• Chart paper and markers

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Standards Alignment

• Operations and Algebraic Thinking: CCSS.MATH.CONTENT.1.OA.A.1
• Number and Operations in Base Ten: CCSS.MATH.CONTENT.1.NBT.B.2
• Early work on number sense and fluency aligns with CCSS.MATH.PRACTICE.MP2 (Reason abstractly and quantitatively) and MP7 (Look for and make use of structure)

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Lesson Procedure

1. Warm-Up and Motivation (10 minutes)

• Counting Together: Begin with a whole-class counting chant, counting from 1 to 20 and back down. Use a large number line visible to all.
• Quick Number talk: Show random number cards (1–20) and ask students to quickly count out loud to match the number with their fingers or manipulatives.
• Engagement Question: "How many ways can we count 7 toys? Let’s see!"

2. Hands-On Addition Exploration (15 minutes)

• Grouping with Manipulatives:
  • Give each student a small set of manipulatives (20 pieces max).
  • Pose practical addition challenges: “Show me 4 blocks. Now add 3 more blocks. How many do you have total?”
  • Have students create physical groups to represent addition problems.
• Addition Mat Use: Students place manipulatives on the addition mat (two groups separated) and then combine to see total.
• Verbalizing the Addition: Guide students to say aloud the addition sentence ("4 plus 3 equals 7") and write the equation on their mini whiteboards.

3. Visual Aids and Counting Strategies (10 minutes)

• Visual Addition Chart Introduction:
  • Show a chart illustrating number combinations for sums within 10 and 20.
  • Highlight patterns such as making tens and doubles (e.g., 5+5).
• Number Line Counting:
  • Using the number line 0-20, demonstrate “counting on” strategy.
  • Model with a scenario: start at 5, then count on 3 more, showing each hop on the number line.
• Partner Practice: Students practice “counting on” in pairs using number lines and dice rolls.

4. Addition Game Stations (15 minutes)

• Game 1: Dice Roll Addition
  • Students roll one or two dice, count dots, and add the results using manipulatives.
• Game 2: Addition Bingo
  • Call out addition sums; students cover answers on their bingo cards.
• Game 3: 'Add and Build' Board Game
  • Move game pieces forward based on addition problems solved.
• Rotate groups every 5 minutes to keep engagement high.

5. Reflection & Assessment (10 minutes)

• Exit Ticket: Each student receives a slip with two addition problems (within 10 or 20). Students use manipulatives or drawings to show and solve the equation.
• Class Discussion:
  • Students share strategies they liked.
  • Teacher prompts: "How did you know the answer? Did counting on help?"
• Anecdotal Notes:
  • Teacher circulates while students work and notes strategies and misconceptions.

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Instructional Strategies

• Multi-sensory Learning: Use of manipulatives and visual charts supports embodied cognition.
• Scaffolding: Start with simpler numbers and concrete objects, gradually move towards symbolic understanding.
• Peer Learning: Partner activities enable sharing diverse counting/addition methods.
• Frequent Verbalization: Encourages math talk, boosting comprehension and vocabulary.
• Positive Reinforcement: Praise correct strategies and creative counting, offer gentle guidance on errors.

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Differentiation

• For advanced students:
  • Challenge with addition sums up to 20 with missing addends. (“__ + 5 = 12. What is the missing number?”)
• For struggling learners:
  • One-on-one assistance with physical manipulatives.
  • Use of simpler numbers (within 10).
  • Repetition of counting strategies with number lines.

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Assessment Methods

• Formative:
  • Observation during activities and games.
  • Anecdotal notes on student counting strategies.
  • Exit tickets assess individual conceptual understanding.
• Summative:
  • Not applicable for this lesson (focus on reinforcement).
• Self-Assessment:
  • Students rate their confidence on a smiley-face chart (“I feel good about adding” / “I need more practice”).

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Extensions and Homework

• Family Number Hunt: Ask students to find and bring examples of addition in their homes (e.g., “3 apples plus 2 bananas”).
• Draw and Add: Draw a picture with two groups of objects and write an addition sentence.

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This lesson promotes solid foundational skills in addition, using manipulative-based strategies aligned to Common Core standards, ideal for first graders prior to formal subtraction introduction.