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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 Ukrainian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...
Oh hell. Ninety-nine is a card game for 2, 3, or 4 players. It is a trick-taking game that can use ordinary French-suited cards. Ninety-nine was created in 1967 by David Parlett; his goal was to have a good 3-player trick-taking game with simple rules yet great room for strategy. In ninety-nine, players bid for the number of tricks that they ...
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. According to The Complete Book of Chisanbop[3] by Hang Young Pai, chisanbop was created in the 1940s in Korea by Sung Jin Pai ...
Trick-taking game. A trick of four cards. North led the 10♠. Usually all players must follow suit and play a spade unless they have none. East does so with the K♠. South does not have a spade, so plays the J♦, and West the 7♥. In a notrump game, east wins the trick, having played the highest card of the suit led, unless the game is an ...
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 the same remainder as ...
Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result. For example, 9 × 27 = 270 − 27 = 243. This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216.
Schafkopf (German: [ˈʃaːfkɔpf], lit. 'sheep's head'), also called Bavarian Schafkopf, is a popular German trick-taking card game of the ace–ten family for four players that evolved, towards the end of the 19th century, from German Schafkopf. It is still very popular in Bavaria, where it is their national card game played by around two ...
The following is a list of trick-taking games by type of pack: 52-card French-suited pack. 304; 3-2-5; ... The following games are played with German-suited packs of ...
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