Holiday Pixel Art

Overview

Students will practice combining like terms by creating holiday-themed pixel art. Through this engaging, hands-on activity, they will reinforce their understanding of algebraic expressions and develop fluency in simplifying expressions aligned with the Common Core State Standards (CCSS).

Common Core Standards

CCSS.MATH.CONTENT.8.EE.C.7
Solve linear equations in one variable.

• Focus: Apply properties of operations to generate equivalent expressions; solve linear equations involving like terms.

CCSS.MATH.CONTENT.8.EE.A.3
Analyze and solve linear equations and pairs of simultaneous linear equations.

• Focus: Use understanding of algebraic structures to combine like terms and simplify expressions.

Learning Objectives

By the end of this 70-minute lesson, students will be able to:

• Identify and combine like terms in algebraic expressions involving variables and constants.
• Simplify algebraic expressions correctly using properties of operations.
• Apply their algebraic skills creatively by designing and decoding pixel art related to holiday images.
• Collaborate in pairs while discussing steps to combine like terms clearly.

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Materials Needed

• Printed pixel grid worksheets with algebraic expressions in each cell.
• Colored pencils/markers (Students will color cells based on the simplified expression results).
• Whiteboard and markers.
• Projector or document camera (optional for demonstration).
• Student notebooks or scratch paper for calculations.

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Detailed Timeline

1. Introduction & Warm-up (10 minutes)

• Start by showing a completed holiday-themed pixel art example (e.g., a Christmas tree or menorah made with colored squares).
• Ask students if they notice a pattern or what might generate the colors on the grid. Introduce that today's challenge combines math and art by using algebraic expressions.
• Briefly review combining like terms: explain terms, coefficients, variables, and how to combine them. Use simple examples on the board.
• State the learning objective clearly.

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2. Guided Practice & Modeling (15 minutes)

• Distribute the pixel grid worksheet with expressions such as:
  • "3x + 5x", "2y + 7", "4a + 3a - a", "5 + 6", etc., strategically placed in the grid.
• Project a portion of the worksheet on the board/document camera.
• Model how to simplify a few expressions aloud step-by-step.
• Show how combined results correspond to specific colors (e.g., simplified expression = 8 → color green; simplified expression = 11 → color red). Provide a color key.
• Emphasize careful combining of like terms and double-checking work.

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3. Independent/Pair Work: Creating the Pixel Art (30 minutes)

• Students work in pairs to simplify the expressions in each cell.
• After solving, they will use the provided color key to color each pixel cell appropriately.
• Encourage students to discuss their reasoning with their partners for each cell.
• Circulate the room and assist where needed.
• Goal: complete enough of the coloring to visually see the holiday pixel image emerge.

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4. Sharing and Reflecting (10 minutes)

• Invite several pairs to present and explain how they combined like terms in certain tricky expressions.
• Have students share observations about how algebra helped reveal the holiday image.
• Highlight common errors and correct misconceptions in real time.
• Ask students to write a quick reflection in their notebooks:
  • What was one thing you learned today?
  • How did combining like terms help you solve this problem?

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5. Closing and Assessment (5 minutes)

• Quick exit ticket: Give students 3 short expressions to simplify on a slip of paper (e.g., 4x + 3x - 2x, 5y + 7 + 3y, 6 + 4).
• Collect responses to gauge individual understanding.
• Remind students to review combining like terms as it will be used in upcoming algebra topics.

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Differentiation & Extensions

• For advanced students: Include expressions with multiple variables and negative coefficients to simplify.
• For students needing support: Provide color-coded scaffolds or partially simplified expressions to guide their work.
• Use a digital pixel art app for tech-savvy classrooms to create virtual versions replicating the same concept.

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Teacher Notes

• This lesson integrates visual art, cooperative learning, and algebraic manipulation for deeper engagement.
• It encourages mathematical discussion and promotes conceptual understanding beyond rote simplification.
• Pixel art creates intrinsic motivation by linking math to festive creativity, making abstract algebra tangible for 8th graders.

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Summary

This lesson plan leverages holiday-themed pixel art to provide a memorable, standards-aligned experience with combining like terms—ensuring students develop critical algebraic skills through an innovative, visual, and collaborative approach.