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A calculator is a practical tool that simplifies the process of performing mathematical operations. It is widely used in various fields, such as education, business, and engineering, to ensure accuracy and efficiency in calculations. Basic calculators handle fundamental arithmetic operations like addition, subtraction, multiplication, and division. In contrast, scientific calculators can solve more complex equations involving trigonometry, logarithms, and statistics. They help users save time and reduce errors, making them invaluable for tasks that require precise numerical computation.* Check & Correct Calculator.* 112 Steps Check.* 12 Digits Big Display.* Tow Way Power (Solar & Battery).* Auto Replay.* Plastic Key.* Function Command Signs.