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  2. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    This is known as the commutative property of addition. (a + b) and (b + a) produce the same output. [7] [8] The sum of two numbers is unique; there is only one correct answer for a sums. [8] When the sum of a pair of digits results in a two-digit number, the "tens" digit is referred to as the "carry digit". [9]

  3. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    The total amount of shapes are 5, which is a consequence of the addition of the objects from the two sets (3 + 2 = 5). Possibly the most basic interpretation of addition lies in combining sets : When two or more disjoint collections are combined into a single collection, the number of objects in the single collection is the sum of the numbers ...

  4. On Numbers and Games - Wikipedia

    en.wikipedia.org/wiki/On_Numbers_and_Games

    In the First Part, Conway abandons the constraint that L<R, and then interprets the form {L|R} as a two-player game: a position in a contest between two players, Left and Right. Each player has a set of games called options to choose from in turn. Games are written {L|R} where L is the set of Left's options and R is the set of Right's options. [3]

  5. Reader Rabbit - Wikipedia

    en.wikipedia.org/wiki/Reader_Rabbit

    The games covered a range of subjects such as reading, phonics, math, and memory. [46] The A.D.A.P.T. Learning Technology was introduced into Reader Rabbit titles in 1999. The system contained a series of customization features that would facilitate the player's learning by assessing abilities, developing skills, adjusting levels, providing ...

  6. Reader Rabbit (video game) - Wikipedia

    en.wikipedia.org/wiki/Reader_Rabbit_(video_game)

    The game takes place in the titular Word Factory, which teaches reading and spelling in four different activities and has over 200 three-letter words and more than 70 pictures for learning. [2] [4] The following four activities are: 1. Sorter - the player is required to pick words that start with a chosen letter and discard the rest. 2.

  7. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    Major System Trainer Free personalisable web application for learning the digit mappings, and encodings for all 1 and 2 digit words; Major System Tool Free web application for converting numbers to words using Derren Brown's encoding. Mnemonic Major System Module A free module for the drupal content management system by rolf vreijdenberger ...

  8. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    command-line tools to manipulate, edit and convert documents; supports filling of PDF forms with FDF/XFDF data. PDF-XChange Viewer: Freeware: Freeware PDF reader, tagger, editor (simple editions) and converter (free for non-commercial uses). Allows edit of text, draw lines, highlighting of Text, measuring distance. Solid PDF Tools: Proprietary

  9. Mnemonic - Wikipedia

    en.wikipedia.org/wiki/Mnemonic

    Knuckle mnemonic for the number of days in each month of the Gregorian calendar.Each knuckle represents a 31-day month. A mnemonic device (/ n ə ˈ m ɒ n ɪ k / nə-MON-ik) [1] or memory device is any learning technique that aids information retention or retrieval in the human memory, often by associating the information with something that is easier to remember.