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  2. 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; only the answers are written down. Calculations can be made at great speed in this way.

  3. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Splitting the dividend into smaller Partial Dividends, then dividing this Partial Dividend by only the left-most digit of the divisor will provide the answer one digit at a time. As you solve each digit of the answer you then subtract Product Pairs (UT pairs) and also NT pairs (Number-Tens) from the Partial Dividend to find the next Partial ...

  4. Fill-In (puzzle) - Wikipedia

    en.wikipedia.org/wiki/Fill-In_(puzzle)

    The solver is given a grid and a list of words. To solve the puzzle correctly, the solver must find a solution that fits all of the available words into the grid. [1] [2] [8] [9] Generally, these words are listed by number of letters, and further alphabetically. [2] [8] Many times, one word is filled in for the solver to help them begin the ...

  5. Word search - Wikipedia

    en.wikipedia.org/wiki/Word_search

    A word search. A word search, word find, word seek, word sleuth or mystery word puzzle is a word game that consists of the letters of words placed in a grid, which usually has a rectangular or square shape. The objective of this puzzle is to find and mark all the words hidden inside the box.

  6. Spiral puzzle - Wikipedia

    en.wikipedia.org/wiki/Spiral_puzzle

    The requested answer in that example therefore has 7 letters. The next clue then starts in box 27 and so on to the center of the spiral. Every square of a spiral puzzle has a single letter written into it by the solver, but the solution can be read in either direction.

  7. Soroban - Wikipedia

    en.wikipedia.org/wiki/Soroban

    A suanpan (top) and a soroban (bottom). The two abaci seen here are of standard size and have thirteen rods each. Another variant of soroban. The soroban is composed of an odd number of columns or rods, each having beads: one separate bead having a value of five, called go-dama (五玉, ごだま, "five-bead") and four beads each having a value of one, called ichi-dama (一玉, いちだま ...

  8. Hangman (game) - Wikipedia

    en.wikipedia.org/wiki/Hangman_(game)

    Example game in which the letters A and N but not the whole word HANGMAN were guessed – incorrect guesses are noted at the bottom Hangman is a guessing game for two or more players. One player thinks of a word , phrase , or sentence and the other(s) tries to guess it by suggesting letters or numbers within a certain number of guesses.

  9. Liber Abaci - Wikipedia

    en.wikipedia.org/wiki/Liber_Abaci

    The book describes methods of doing calculations without aid of an abacus, and as Ore (1948) confirms, for centuries after its publication the algorismists (followers of the style of calculation demonstrated in Liber Abaci) remained in conflict with the abacists (traditionalists who continued to use the abacus in conjunction with Roman numerals).