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  2. Sylver coinage - Wikipedia

    en.wikipedia.org/wiki/Sylver_coinage

    Sylver coinage is a mathematical game for two players, invented by John H. Conway. [1] The two players take turns naming positive integers that are not the sum of nonnegative multiples of previously named integers. The player who names 1 loses. For instance, if player A opens with 2, B can win by naming 3 as A is forced to name 1. [2]

  3. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Minor aspects of the presentation are adjustable, for example the cards can be dealt either face-up or face-down. If they are dealt face-down then the spectator must look through each of the piles until finding which one contains the selected card, whereas if they are dealt face-up then an attentive spectator can immediately answer the question of which pile contains the selected card.

  4. List of five-number lottery games - Wikipedia

    en.wikipedia.org/wiki/List_of_five-number...

    The lists do not include "4+1" games, such as Florida's Lucky Money, where all five numbers must be matched to win the top prize, but are drawn from two number fields(A similar game, Montana's "Big Sky Bonus", is actually a "four-number" game; the double matrix is 4/31 + 1/16(previously was 4/28 + 1/17). Matching all four "regular" numbers wins ...

  5. 27 (number) - Wikipedia

    en.wikipedia.org/wiki/27_(number)

    The Moon revolves around the Earth the same direction as Earth spins but 27 (27.3) times slower. 27km is the circumference of the LHC located at CERN in Meyrin Switzerland; The atomic number of cobalt. Dark matter is thought to make up 27% of the universe. [12] 27 is the number of bones in the human hand. [13]

  6. 24 (puzzle) - Wikipedia

    en.wikipedia.org/wiki/24_(puzzle)

    The original version of 24 is played with an ordinary deck of playing cards with all the face cards removed. The aces are taken to have the value 1 and the basic game proceeds by having 4 cards dealt and the first player that can achieve the number 24 exactly using only allowed operations (addition, subtraction, multiplication, division, and parentheses) wins the hand.

  7. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    This technique allows easy multiplication of numbers close and below 100.(90-99) [2] The variables will be the two numbers one multiplies. The product of two variables ranging from 90-99 will result in a 4-digit number. The first step is to find the ones-digit and the tens digit. Subtract both variables from 100 which will result in 2 one-digit ...

  8. Play Dominoes All Fives Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/...

    Dominoes: All Fives. All Fives features beautiful art, fast gameplay, and solo or multiplayer modes. Expose multiples of five and score! By Masque Publishing

  9. Number Munchers - Wikipedia

    en.wikipedia.org/wiki/Number_Munchers

    There are five different modes of play in Number Munchers to advance players' mathematical skills. These modes include Multiples, Factors, Primes, Equalities, and Inequalities: Multiples - the objective is to find multiples of the number given. If presented with a 3, one would select numbers like 3, 6, 9, 12, etc.

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