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Adding and Subtracting a Negative Integer on a Number Line

Adding and Subtracting a Negative Integer on a Number Line
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2016-01-07 13:48
VectorCoordinate GeometryGeometric Construction
This example visually demonstrates the addition and subtraction of a negative integer using a number line. It covers core math concepts like number line, opposite numbers, addition, and subtraction. The construction utilizes GeoGebra commands/objects such as Point, OrthogonalLine, Vector, Distance, Segment, and Midpoint. Suitable for middle school mathematics education to help students understand the geometric meaning of negative number operations.

GeoGebra Commands & Parameters

  1. Point(xAxis) → A
  2. OrthogonalLine(A, xAxis) → b_1
  3. Vector(D, G) → v
  4. Distance(A, H) → distanceAH
  5. Segment(A, H) → c
  6. Distance(A, H) → d
  7. Segment(E, F) → e
  8. Segment(D, G) → f
  9. Segment(H, A) → i
  10. Distance(A, H) → m
  11. Distance(A, I) → distanceAI
  12. Midpoint(F, E) → L
  13. Midpoint(D, G) → M
  14. Vector(F, N) → g
  15. Midpoint(N, F) → O