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  2. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

  3. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp.

  4. Three cups problem - Wikipedia

    en.wikipedia.org/wiki/Three_cups_problem

    The three cups problem, also known as the three cup challenge and other variants, is a mathematical puzzle that, in its most common form, cannot be solved. In the beginning position of the problem, one cup is upside-down and the other two are right-side up. The objective is to turn all cups right-side up in no more than six moves, turning over ...

  5. Euchre - Wikipedia

    en.wikipedia.org/wiki/Euchre

    Euchre. Euchre or eucre (/ ˈjuːkər / YU-kər) is a trick-taking card game commonly played in Australia, Canada, Great Britain, New Zealand, and the Midwestern United States. It is played with a deck of 24, 25, 28, or 32 standard playing cards. There are normally four players, two on each team, although there are variations for two to nine ...

  6. 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.

  7. Coin magic - Wikipedia

    en.wikipedia.org/wiki/Coin_magic

    Coin magic. Coin magic is the manipulating of coins to entertain audiences. [1] Because coins are small, most coin tricks are considered close-up magic or table magic, as the audience must be close to the performer to see the effects. Though stage conjurers generally do not use coin effects, coin magic is sometimes performed onstage using large ...

  8. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    If the hundreds digit is odd, the number obtained by the last two digits must be 4 times an odd number. 352: 52 = 4 x 13. Add the last digit to twice the rest. The result must be divisible by 8. 56: (5 × 2) + 6 = 16. The last three digits are divisible by 8. [2][3] 34,152: Examine divisibility of just 152: 19 × 8.

  9. 31 Things You Should Always Buy at Trader Joe's - AOL

    www.aol.com/31-things-always-buy-trader...

    Related: 10 Genius Ways to Use Trader Joe’s Chile Lime Seasoning—AKA the Greatest Invention of All Time 23. Plain Unsweetened Organic Creamy Cashew Cultured Yogurt Alternative

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