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2. 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 ...

3. Krypto (game) - Wikipedia

   en.wikipedia.org/wiki/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.

4. 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.

5. Shut the box - Wikipedia

   en.wikipedia.org/wiki/Shut_the_box

   Traditional pub play. In English pubs, shut the box is traditionally played as a gambling game. Each player deposits an agreed amount of money into a pool at the beginning of the game, and the winner of the game collects the money in pool at the end of the game and in some cases the box as well.

6. Nimber - Wikipedia

   en.wikipedia.org/wiki/Nimber

   Unlike many other nimber related games, the number of spaces between the two tokens on each row are the sizes of the Nim heaps. If your opponent increases the number of spaces between two tokens, just decrease it on your next move. Else, play the game of Nim and make the Nim-sum of the number of spaces between the tokens on each row be 0. [3]

7. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   t. e. Multiplication (often denoted by the cross symbol ×, by the mid-line dot operator ⋅, by juxtaposition, or, on computers, by an asterisk *) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division. The result of a multiplication operation is called a product.