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2. Blackstone's Card Trick Without Cards - Wikipedia

   en.wikipedia.org/wiki/Blackstone's_Card_Trick...

   Take the card's face value (with aces counting as 1 and royal cards counting as 11, 12 and 13 respectively) Double it. Add 3. Multiply by 5. If the card the spectator is thinking of is a spade, subtract 1. If the card the spectator is thinking of is a heart, subtract 2. If the card the spectator is thinking of is a club, subtract 3.

3. Promptuary - Wikipedia

   en.wikipedia.org/wiki/Promptuary

   The promptuary, also known as the card abacus is a calculating machine invented by the 16th-century Scottish mathematician John Napier and described in his book Rabdologiae [1] in which he also described Napier's bones . It is an extension of Napier's Bones, using two sets of rods to achieve multi-digit multiplication without the need to write ...

4. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

6. Krypto (game) - Wikipedia

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

   Krypto (game) A spread of Krypto cards: players must find a way to calculate 12 using the numbers 5, 19, 8, 3 and 6. Krypto is a card game designed by Daniel Yovich in 1963 and published by Parker Brothers and MPH Games Co. [1] It is a mathematical game that promotes proficiency with basic arithmetic operations.

7. Free Online Card Games - No Downloads - AOL Games

   www.aol.com/games/card

   No download needed, play free card games right now! Browse and play any of the 40+ online card games for free against the AI or against your friends. Enjoy classic card games such as Hearts, Gin ...