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2. Quizlet - Wikipedia

   en.wikipedia.org/wiki/Quizlet

   Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]

3. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   The oldest known multiplication tables were used by the Babylonians about 4000 years ago. [2] However, they used a base of 60. [2] The oldest known tables using a base of 10 are the Chinese decimal multiplication table on bamboo strips dating to about 305 BC, during China's Warring States period. [2] "Table of Pythagoras" on Napier's bones [3]

4. Flashcard - Wikipedia

   en.wikipedia.org/wiki/Flashcard

   A flashcard or flash card is a card bearing information on both sides, usually intended to practice and/or aid memorization. It can be virtual (part of a flashcard software ) or physical. Typically, each flashcard bears a question or definition on one side and an answer or target term on the other.

5. The History of Mathematical Tables - Wikipedia

   en.wikipedia.org/wiki/The_History_of...

   The History of Mathematical Tables: from Sumer to Spreadsheets is an edited volume in the history of mathematics on mathematical tables.It was edited by Martin Campbell-Kelly, Mary Croarken, Raymond Flood, and Eleanor Robson, developed out of the presentations at a conference on the subject organised in 2001 by the British Society for the History of Mathematics, [1] [2] and published in 2003 ...

6. Multiplication sign - Wikipedia

   en.wikipedia.org/wiki/Multiplication_sign

   In algebra, it is a notation to resolve ambiguity (for instance, "b times 2" may be written as b⋅2, to avoid being confused with a value called b 2). This notation is used wherever multiplication should be written explicitly, such as in " ab = a ⋅2 for b = 2 "; this usage is also seen in English-language texts.

7. Persistence of a number - Wikipedia

   en.wikipedia.org/wiki/Persistence_of_a_number

   The additive persistence of 2718 is 2: first we find that 2 + 7 + 1 + 8 = 18, and then that 1 + 8 = 9. The multiplicative persistence of 39 is 3, because it takes three steps to reduce 39 to a single digit: 39 → 27 → 14 → 4. Also, 39 is the smallest number of multiplicative persistence 3.

8. Anki (software) - Wikipedia

   en.wikipedia.org/wiki/Anki_(software)

   One card may have a question (expression) and an answer (pronunciation, meaning). By keeping the separate cards linked to the same fact, spelling mistakes can be adjusted against all cards at the same time, and Anki can ensure that related cards are not shown in too short a spacing. A special note type allows the generation of cloze deletion ...

9. Multiple (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Multiple_(mathematics)

   Each of the products listed below, and in particular, the products for 3 and −6, is the only way that the relevant number can be written as a product of 7 and another real number: 14 = 7 × 2 ; {\displaystyle 14=7\times 2;}