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2. Concentration (card game) - Wikipedia

   en.wikipedia.org/wiki/Concentration_(card_game)

   Matching cards are removed from the game when paired. Concentration is a round game in which all of the cards are laid face down on a surface and two cards are flipped face up over each turn. The object of the game is to turn over pairs of matching cards. Concentration can be played with any number of players or as a solitaire or patience game.

3. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table

4. Ninety-nine (addition card game) - Wikipedia

   en.wikipedia.org/wiki/Ninety-nine_(addition_card...

   Ninety-nine is a simple card game based on addition and reportedly popular among the Romani people. [1] It uses one or more standard decks of Anglo-American playing cards in which certain ranks have special properties, and can be played by any number of players. During the game, the value of each card played is added to a running total which is ...

5. Leitner system - Wikipedia

   en.wikipedia.org/wiki/Leitner_system

   An alternative method where incorrect answers are only moved back by one box. The Leitner system[1][2][3] is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. [4][5] It is a simple implementation of the principle of spaced repetition, where cards are reviewed at ...

6. The New England Primer - Wikipedia

   en.wikipedia.org/wiki/The_New_England_Primer

   The New England Primer was the first reading primer designed for the American colonies. It became the most successful educational textbook published in 17th-century colonial United States and it became the foundation of most schooling before the 1790s. In the 17th century, the schoolbooks in use had been Bibles brought over from England.

7. Math Images Project - Wikipedia

   en.wikipedia.org/wiki/Math_Images_Project

   Math Images Project. The logo of the Math Images Project. The Math Images Project is a wiki collaboration between Swarthmore College, the Math Forum at Drexel University, and the National Science Digital Library. The project aims to introduce the public to mathematics through beautiful and intriguing images found throughout the fields of math.