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  2. List of pre-Columbian inventions and innovations of ...

    en.wikipedia.org/wiki/List_of_pre-Columbian...

    Abacus – The Aztec and Maya of Mesoamerica performed arithmetic operations using an abacus. It served as a more accurate and faster alternative to a written solution or relying on memory. Archaeologists have recorded the Mesoamerican abacus, or Nepohualtzintzin, as being present in Mesoamerica from at least between 900 and 1000 CE. [1]

  3. Abacus (architecture) - Wikipedia

    en.wikipedia.org/wiki/Abacus_(architecture)

    Abacus of the Rampurva capital from the time of Emperor Ashoka, 3rd century BCE, India. In śilpaśāstra, the ancient Indian science of sculpture, the abacus is commonly termed as phalaka (or phalakā). [6] It consists of a flat plate and forms part of the standard pillar . The phalaka should be constructed below the potikā ("bracket"). It is ...

  4. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Mental abacus – As students become used to manipulating the abacus with their fingers, they are typically asked to do calculation by visualizing abacus in their head. Almost all proficient abacus users are adept at doing arithmetic mentally. [citation needed] Chisanbop

  5. Mental abacus - Wikipedia

    en.wikipedia.org/wiki/Mental_abacus

    The abacus system of mental calculation is a system where users mentally visualize an abacus to carry out arithmetical calculations. [1] No physical abacus is used ...

  6. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    An abacus (pl. abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Hindu–Arabic numeral system. [1] An abacus consists of a two-dimensional array of slidable beads (or similar objects). In their ...

  7. Screen generator - Wikipedia

    en.wikipedia.org/wiki/Screen_generator

    A screen generator, also known as a screen painter, screen mapper, [1] or forms generator is a software package (or component thereof) which enables data entry screens to be generated declaratively, by "painting" them on the screen WYSIWYG-style, or through filling-in forms, rather than requiring writing of code to display them manually.

  8. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

  9. Liber Abaci - Wikipedia

    en.wikipedia.org/wiki/Liber_Abaci

    The 2, 8, and 9 resemble Arabic numerals more than Eastern Arabic numerals or Indian numerals. The Liber Abaci or Liber Abbaci [ 1 ] ( Latin for "The Book of Calculation") was a 1202 Latin work on arithmetic by Leonardo of Pisa, posthumously known as Fibonacci .