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Besides fingers, Abacus is probably the oldest calculator that we know of. Originally they were made of beans or stones moved in grooves in sand or on tablets of wood, stone, or metal. Today they are constructed as a bamboo frame with beads sliding on wires. The beads represent numbers and are manipulated by fingers to perform calculations.
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The first mechanical calculator appeared in 1642, the creation of French intellectual and mathematics whizz kid Blaise Pascal as "a device that will eventually perform all four arithmetic operations without relying on human intelligence."
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First Calculator was invented by Blaise Pascal. This calculator was nothing like the calculators today.
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a remarkable mechanical calculator, based on the stepped drum mechanism of Lebnitz. It is a small, hand-cranked mechanical calculator, designed in 1930s, but introduced as late as 1948. This calculator was nothing like the calculators now
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These are used for solving basic Math problems and have a very simple design. They may come with a single screen, have a dual LED screen or have a Three Line Display. These are commonly used and are pocket-friendly too.
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These types of calculators are used to plot the graphs of various functions and expressions. Generally used by students to understand concepts, these are extensively used in the education sector.
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The HP-35 was Hewlett-Packard 's first pocket calculator and the world's first scientific pocket calculator: a calculator with trigonometric and exponential functions .
