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In the 9th century named the abacus

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They have really helped me through out the years, in Algebra it helped me way much more. And now in Geometry. I like calculators

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something used for making mathematical calculations, in particular a small electronic device with a keyboard and a visual display.

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A beautiful, free online scientific calculator with advanced features for evaluating percentages, fractions, exponential functions, logarithms, trigonometry, statistics, and more.