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Modeling Fractions and Decimals

Modeling Fractions and Decimals
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2017-05-01 20:50
PolygonCoordinate GeometryGeometric ConstructionSlider Animation
This example uses geometric shapes to demonstrate the concepts of fractions and decimals. It involves key mathematical concepts such as fractions, coordinates, parallelograms, and triangles. Using GeoGebra commands like Corner, Point, and Polygon, dynamic constructions of these geometric shapes are possible. Suitable for students from upper elementary to middle school levels.

GeoGebra Commands & Parameters

  1. Corner(5) → A_1
  2. Point(Sequence[(k, 0), k, 0, 3.6, 0.1]) → A
  3. Point(Sequence[(x(A) + 0.1, j), j, 0, 1, 0.1]) → B
  4. Polygon((1.3, 0), (2.3, 0), (2.3, 1), (1.3, 1)) → poly3, i, j, k, l
  5. Polygon((2.6, 0), (3.6, 0), (3.6, 1), (2.6, 1)) → poly4, m, n, p, q
  6. If((x(A) ≥ 1) ∧ (x(A) < x(Vertex[poly3, 1])) ∨ (x(A) ≥ x(Vertex[poly3, 2])) ∧ (x(A) < x(Vertex[poly4, 1])) ∨ x(A) ≟ x(Vertex[poly4, 2]), true, false) → integer
  7. Polygon(A, A + (0.1, 0), A + (0.1, If[integer, 0, y(B)]), A + (0, If[integer, 0, y(B)])) → poly8, j_1, k_1, l_1, m_1
  8. Polygon((0, 0), (Min[x(A), 1], 0), (Min[x(A), 1], 1), (0, 1)) → poly5, r, s, t, a_1
  9. Polygon((x(Vertex[poly3, 1]), 0), (Max[Min[x(A), x(Vertex[poly3, 1]) + 1], x(Vertex[poly3, 1])], 0), (Max[Min[x(A), x(Vertex[poly3, 1]) + 1], x(Vertex[poly3, 1])], 1), (x(Vertex[poly3, 1]), 1)) → poly6, b_1, c_1, d_1, e_1
  10. Polygon((x(Vertex[poly4, 1]), 0), (Max[Min[x(A), x(Vertex[poly4, 1]) + 1], x(Vertex[poly4, 1])], 0), (Max[Min[x(A), x(Vertex[poly4, 1]) + 1], x(Vertex[poly4, 1])], 1), (x(Vertex[poly4, 1]), 1)) → poly7, f_1, g_1, h_1, i_1
  11. Polygon((0.8187524918794742, 1.1041021645196354), (1.818752491879475, 1.1041021645196354), (1.818752491879475, 2.1041021645196336), (0.8187524918794742, 2.1041021645196336)) → poly1, a, b, c, d
  12. Polygon((0, 0), (1, 0), (1, 1), (0, 1)) → poly2, e, f, g, h
  13. Sequence(Segment[(0, j), (1, j)], j, 0, 1, 0.1) → list4
  14. Sequence(Segment[(x(Vertex[poly3, 1]), j), (x(Vertex[poly3, 1]) + 1, j)], j, 0, 1, 0.1) → list5
  15. Sequence(Segment[(x(Vertex[poly4, 1]), j), (x(Vertex[poly4, 1]) + 1, j)], j, 0, 1, 0.1) → list6
  16. Sequence(Segment[(i, 0), (i, 1)], i, 0, 1, 0.1) → list1
  17. Sequence(Segment[(x(Vertex[poly3, 1]) + i, 0), (x(Vertex[poly3, 1]) + i, 1)], i, 0, 1, 0.1) → list2
  18. Sequence(Segment[(x(Vertex[poly4, 1]) + i, 0), (x(Vertex[poly4, 1]) + i, 1)], i, 0, 1, 0.1) → list3
  19. If(y(B) < 1, (100 * poly8), 0) → hundredthdigit