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  2. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

  3. Hipster PDA - Wikipedia

    en.wikipedia.org/wiki/Hipster_PDA

    A Hipster PDA. The Hipster PDA is a paper-based personal organizer, popularized by Merlin Mann in 2004. [1] Originally a tongue-in-cheek reaction to the increasing expense and complexity of personal digital assistants (PDA), the Hipster PDA (said to stand for "Parietal Disgorgement Aid" and often abbreviated to "hPDA") comprises a sheaf of index cards held together with a binder clip.

  4. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    e. Multiplication (often denoted by the cross symbol ×, by the mid-line dot operator ⋅, by juxtaposition, or, on computers, by an asterisk *) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division. The result of a multiplication operation is called a product.

  5. Napier's bones - Wikipedia

    en.wikipedia.org/wiki/Napier's_bones

    Location arithmetic. v. t. e. Napier's bones is a manually operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication, and also called rabdology, a word invented by Napier. Napier published his version in 1617. [1]

  6. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Slide rule. Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.

  7. Zettelkasten - Wikipedia

    en.wikipedia.org/wiki/Zettelkasten

    Zettelkasten. A German scholar's physical Zettelkasten or card file. A card file for personal knowledge management can be made up of notes containing numbers, tags (blue) and cross-references to other notes (red). A tag index (bottom right) allows topical cross-referencing. A Zettelkasten (German: 'slipbox', plural Zettelkästen) or card file ...

  8. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    The multiplication sign (×), also known as the times sign or the dimension sign, is a mathematical symbol used to denote the operation of multiplication, which results in a product. [ 1 ] The symbol is also used in botany , in botanical hybrid names and the heavy goods vehicle industry, to calculate the amount of powered wheels.

  9. Index card - Wikipedia

    en.wikipedia.org/wiki/Index_card

    An index card in a library card catalog.This type of cataloging has mostly been supplanted by computerization. A hand-written American index card A ruled index card. An index card (or record card in British English and system cards in Australian English) consists of card stock (heavy paper) cut to a standard size, used for recording and storing small amounts of discrete data.

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