Interactive Demonstration of 'Between-ness' in Addition and Subtraction

① This example uses randomly generated numbers and interactive input boxes to visually show how the sum or difference of two numbers lies 'between' the minimum and maximum possible values, helping students understand intervals and boundaries in addition and subtraction. ② Core mathematical concepts include properties of addition and subtraction, maximum and minimum (Max/Min), random number generation, and inequality relations, with preliminary ideas of combinatorics and confidence intervals. ③ Construction highlights: GeoGebra commands such as Random, Max, Min, and Textfield are used; objects include buttons (button1, button2), input boxes (InputBox1, InputBox2), text objects (text1 to text7), and numeric variables (a, b, c, d, e, f, g, h, i, j) storing values; mySum and myDiff represent the sum and difference, while minSum, maxSum, minDiff, maxDiff define the bounds. ④ Suitable for upper elementary to middle school students, this interactive tool is ideal for classroom activities or self-paced exploration, and serves as a teacher demonstration aid to build intuitive understanding of result ranges in arithmetic operations.