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All clear button clears the calculator, tape, and resets any functions Memory recall button retrieves the number you have in memory and places it in the display field Memory plus button adds the number displayed to the contents of the memory Memory minus button subtracts the number displayed from the contents of the memory. The original calculator was invented in the 17th century by a frenchman called blaise pascal He was just 18 years old, and wanted to help his father do his tax calculations. A beautiful, free online scientific calculator with advanced features for evaluating percentages, fractions, exponential functions, logarithms, trigonometry, statistics, and more. Use the best online calculator for any math calculations on pc and smartphones The free calculator allows you to quickly and accurately perform arithmetic, calculate percentages, raise to a power or take a root Use this basic calculator online for math with addition, subtraction, division and multiplication The calculator includes functions for square root, percentage, pi, exponents, powers and rounding. Enter the expression you want to evaluate The math calculator will evaluate your problem down to a final solution You can also add, subtraction, multiply, and divide and complete any arithmetic you need Click the blue arrow to submit and see your result! Includes basic handheld calculator functions for square, square root, percent, sign change, pi and memory.