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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. The Hardest Logic Puzzle Ever - Wikipedia

    en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever

    If A answers da, C is Random, and B is the opposite of A. One can elegantly obtain truthful answers in the course of solving the original problem as clarified by Boolos ("if the coin comes down heads, he speaks truly; if tails, falsely") without relying on any purportedly unstated assumptions, by making a further change to the question:

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Step 4 is where the units digit to step 3’s initial answer to: (u 1 • u 2) is attached (symbolized by: @) to the end of the sum of steps 1-3. Step 4 = D @ u (u 1 • u 2) = E. Finally this number is taken and the following is added to it: Step 5 = E + (T 1 • T 2) = Final Answer. For example, in the following problem: 79 • 26, by ...

  5. 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 ...

  6. 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 ...

  7. 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.

  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. Verbal arithmetic - Wikipedia

    en.wikipedia.org/wiki/Verbal_arithmetic

    Verbal arithmetic, also known as alphametics, cryptarithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters of the alphabet. The goal is to identify the value of each letter.