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Integer Operations on the Number Line

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About This MicroSim

Interactive horizontal number line demonstrating integer addition, subtraction, and directional movement from -10 to +10. This interactive learning tool provides direct visual feedback, enabling students to explore algebraic structures dynamically.

Iframe Embed Code

Copy this iframe to your website:

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<iframe src="https://dmccreary.github.io/algebra-1/sims/integer-ops-number-line/main.html"
        height="247px" width="100%" scrolling="no"></iframe>

Lesson Plan

Learning Objective

Model positive and negative integer addition and subtraction using directed vector arrows along a number line.

Audience and Prerequisites

Designed for Algebra I students in grade 9. Students should have arithmetic fluency and introductory familiarity with algebraic notation.

Suggested Activity

  1. Ask students to make a prediction before interacting with controls or moving parameters.
  2. Input operations like (-4) + 7 or 3 - 8 and observe movement direction, starting points, and resulting positions.
  3. Compare the visual model directly with the symbolic algebraic expression.
  4. Have students summarize their observations in a single sentence.

Assessment

Students predict the direction and final value of integer calculations without using a calculator.

References

  1. Related Algebra I Chapter - Course explanation and background context.
  2. p5.js Reference - Official library documentation.