Addition and Subtraction Fun

Curriculum Focus

Grade Level: 1st Grade
Curriculum Area: Number & Operations in Base Ten
Standard: 1.OA.C.5 - Relate counting to addition and subtraction.

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Objective

By the end of this 8-minute session, students will:

1. Use a number line to visualize and solve addition and subtraction problems up to 20.
2. Demonstrate understanding of moving forward for addition and backward for subtraction on the number line.

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Materials Needed

• A large laminated number line (0-20) taped on the floor.
• Individual mini number lines (cardstock strips for each student).
• Dry-erase markers (for individual use).
• A "magic jumping frog" prop or figurine (optional, small playful toy).
• Problem cards (pre-made cards with simple equations like "12 - 4" or "8 + 7").

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Lesson Breakdown

1. Warm-Up (1 minute)

• Begin with an engaging question: "Who’s ready to jump into math today?"
• Show the class the laminated number line on the floor. Introduce it by saying:
  "This is our math road! Numbers live here, and they help us with adding and subtracting. Today, we’re going to take a little number line adventure!"
• Use the magic jumping frog figure to make this playful. "Our frog is going to help us hop and solve problems!"

2. Direct Instruction & Modeling (2 minutes)

1. Addition Example on the Floor Number Line:

   • Place the frog at "5." Say: "We want to do 5 + 3. Let’s help our frog jump forward 3 times!" Move the frog forward 3 spaces. "Where did he land? That’s right—on 8! So, 5 + 3 = 8."
   • Emphasize: "Whenever we add, we always hop forward on the number line!"

2. Subtraction Example on the Floor Number Line:

   • Place the frog at "10." Say: "Now let’s do 10 - 4. This time, our frog will hop backward. Let’s count together as he hops back 4 times!" Move the frog back 4 spaces. "Where did he land? On 6, so 10 - 4 = 6!"
   • Emphasize: "When we subtract, we always hop backward on the number line."

3. Guided Practice (3 minutes)

1. Hand out mini number lines and dry-erase markers to each student.
2. Show a problem card (e.g., "8 + 7") and have students solve it using their mini number lines. Walk around to provide assistance and check accuracy. Encourage them to count the hops as they go.
3. Flash another problem card (e.g., "14 - 5") and repeat.

Engagement tip: After each correct answer, let the student pretend to "hop" themselves (on the large floor number line) to explain their thinking to the group.

4. Quick Challenge & Wrap-Up (2 minutes)

1. Pair students up and give each pair two problem cards to solve together (one addition, one subtraction).
2. As they finish, gather back as a group and have students share their solutions.
3. End with a mini-quiz game:
   • Say a problem aloud (e.g., "What is 9 + 4?") and let them shout or show the answer on their number lines.

Closing Statement: "Amazing work today! You’ve learned how to jump forward and backward on the number line like true math adventurers!"

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Differentiation

• For Advanced Learners: Use larger numbers, such as addition and subtraction problems up to 30.
• For Struggling Learners: Provide pre-marked "hop tracks" on their number lines to help them zoom in on counting.

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Assessment

During guided practice and the mini-quiz game, observe students’ ability to solve problems and explain their thinking. Collect mini number lines to check for correct work.

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Closing Note for Teachers

Using the floor-number-line approach adds kinesthetic learning to the task, which is especially beneficial for younger students. This playful, dynamic method instills confidence and makes abstract math concepts more tangible. Enjoy their smiles and enthusiasm!