Adding and Subtracting Decimals Interactive Practice

① This example demonstrates the process of adding and subtracting decimal numbers through randomly generated problems with immediate correctness feedback. ② The core mathematical concepts are decimal addition and subtraction, including place-value alignment, carrying, and borrowing. ③ Construction highlights: It uses GeoGebra commands such as Textfield and Random to generate problems and input fields, a button (button1) to trigger checking, boolean variables (good, correct_1, wrong_1) to control feedback display, and builds two separate flows for addition (add) and subtraction (sub) with multiple text objects (text1~text7) and answer objects (ans, ans2). ④ Suitable for upper elementary or middle school students to practice decimal arithmetic independently, and also useful for teachers in classroom demonstrations or after-class reinforcement.