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Solving Addition Equations Using Scales

Solving Addition Equations Using Scales
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2017-12-01 22:53
FunctionCoordinate GeometryGeometric ConstructionSlider AnimationGraphing
This example demonstrates how to solve addition equations using a dynamic balance scale, visually representing the concept of equilibrium and inverse operations. Core math concepts include equation balancing, addition inverses, and algebraic solutions. Constructed with GeoGebra commands like Polygon, Circle, Random, Frequency, and Textfield, featuring objects such as ScaleBottom1, ScaleArm, and Locus. Ideal for middle school mathematics education to visualize equation-solving processes.

GeoGebra Commands & Parameters

  1. Polygon((2.75, 1.95), (2.75, 2.05), (8.25, 2.05), (8.25, 1.95)) → ScaleBottom1, f, g, h, i
  2. Polygon((4.3, 2.35), (4.3, 2.55), (6.7, 2.55), (6.7, 2.35)) → ScaleBottom3, n, p, q, r
  3. Polygon((5, 2.55), (5, 3.25), (6, 3.25), (6, 2.55)) → ScaleBottom4, s, t, d, e
  4. Polygon((2.75, 2.05), (2.75, 2.35), (8.25, 2.35), (8.25, 2.05)) → ScaleBottom2, j, k, l, m
  5. Polygon(Left + (0, 0.2), Left - (0, 0.2), Right - (0, 0.2), Right + (0, 0.2)) → ScaleArm, f_1, g_1, h_1, i_1
  6. Circle(Left, 0.5) → LeftArmCircle1
  7. Circle(Left, 0.3) → LeftArmCircle2
  8. Circle(Right, 0.5) → RightArmCircle1
  9. Circle(Right, 0.3) → RightArmCircle2
  10. Polygon(Left - (0.15, 0), Left + (0.15, 0), Left + (0.15, 0.8), Left + (-0.15, 0.8)) → LeftArmStand, j_1, k_1, l_1, m_1
  11. Polygon(Right - (0.15, 0), Right + (0.15, 0), Right + (0.15, 0.8), Right + (-0.15, 0.8)) → RightArmStand, n_1, p_1, q_1, r_1
  12. Polygon(Left + (-2.25, 0.8), Left + (-2.25, 1), Left + (2.25, 1), Left + (2.25, 0.8)) → LeftTray, s_1, t_1, a_1, b_1
  13. Polygon(Right + (-2.25, 0.8), Right + (-2.25, 1), Right + (2.25, 1), Right + (2.25, 0.8)) → RightTray, c_1, d_1, e_1, f_2
  14. Circle((5.5, 3.4), 0.6) → ScaleBottom5
  15. Circle((5.5, 3.4), 0.4) → ScaleBottom6
  16. Random(1, 2) → sideorder
  17. Polygon((-3.8, 4.6), (-1, 4.6), (-1, 3.2), (-3.8, 3.2)) → ImageBox, c, g_2, h_2, i_2
  18. Frequency(Sort[Insert[{0, 1, 2}, Last[ImageLocator, 19], -1]]) → Occurences
  19. Textfield(usertext) → InputBox1