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Fraction Addition Area Model

Fraction Addition Area Model
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2015-06-27 09:18
TrigonometryCoordinate GeometryGeometric Construction
In collections Fraction worksheets
This example demonstrates the geometric meaning of fraction addition using an area model. Key math concepts include fraction addition, area model, least common multiple (LCM), and similar triangles. GeoGebra commands used are Circle, Sequence, LCM, with objects like d1, n1, d2, n2, A1, B1. Suitable for middle school mathematics teaching to visually understand fraction addition operations.

GeoGebra Commands & Parameters

  1. Circle(A1, B1) → c
  2. Circle(A2, B2) → d
  3. Sequence(Segment[A1, Rotate[B1, t°, A1]], t, 0, 360, 360 / d1) → list1
  4. Sequence(Segment[A2, Rotate[B2, t°, A2]], t, 0, 360, 360 / d2) → list2
  5. Sequence(CircleSector[A1, Rotate[B1, t°, A1], Rotate[B1, (t + 360 / d1)°, A1]], t, 0, ((n1 - 1) * 360 / d1), 360 / d1) → list3
  6. Sequence(CircleSector[A2, Rotate[B2, t°, A2], Rotate[B2, (t + 360 / d2)°, A2]], t, 0, ((n2 - 1) * 360 / d2), 360 / d2) → list4
  7. LCM(d1, d2) → lcd
  8. Sequence(Segment[A1, Rotate[B1, t°, A1]], t, 0, 360, 360 / d11) → list5
  9. Sequence(Segment[A2, Rotate[B2, t°, A2]], t, 0, 360, 360 / d22) → list6