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The HP-28C and HP-28S were two graphing calculators produced by Hewlett-Packard from 1986 to 1992. The HP-28C was the first handheld calculator capable of solving equations symbolically. They were replaced by the HP 48 series of calculators, which grew from the menu-driven RPL programming language interface first introduced in these HP-28 series.
As the first electronic educational toy, [6] [7] the Little Professor is a common item on calculator collectors' lists. [8] In 1976, the Little Professor cost less than $20. More than 1 million units sold in 1977. [9]
An electronic calculator is typically a portable electronic device used to perform calculations, ... [22] [26] [27] [28] Programmable calculators ...
A graphing calculator is a class of hand-held calculator that is capable of plotting graphs and solving complex functions. While there are several companies that manufacture models of graphing calculators, Hewlett-Packard is a major manufacturer. The following table compares general and technical information for Hewlett-Packard graphing ...
The HP 48 is a series of graphing calculators designed and produced by Hewlett-Packard from 1990 until 2003. [1] The series includes the HP 48S, HP 48SX, HP 48G, HP 48GX, and HP 48G+, the G models being expanded and improved versions of the S models.
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Casio used to call this feature Natural Display or Natural textbook display, [24] [25] but now uses Natural-VPAM. [26] Sharp calls this WriteView [27] on its scientific calculators and simply Equation Editor on its graphing calculators. [28]
The Mental Calculation World Cup 2018 was held on 28–30 September 2018 at the Phaeno Science Center in Wolfsburg, Germany. 82 calculators from 24 countries applied for the qualification; 33 calculators from 17 countries were qualified and took part at the contest in Wolfsburg. The World Cup involved the following 5 main contests: