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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]
Electronic flashcards may have a three-sided card. [2] Such a card has three fields, Q, A, and A*, where Q & A are reversed on flipping, but A* is always in the answer—the two "sides" are thus Q/A,A* and A/Q,A*. These are most often used for learning foreign vocabulary, where the foreign pronunciation is not transparent from the foreign writing.
Spaced repetition is an evidence-based learning technique that is usually performed with flashcards. Newly introduced and more difficult flashcards are shown more frequently, while older and less difficult flashcards are shown less frequently in order to exploit the psychological spacing effect. The use of spaced repetition has been proven to ...
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 increasing intervals.
Wordly Wise 3000 is an American series of workbooks published by Educators Publishing Service for the teaching of spelling and vocabulary. Books A through C (for grades 2–4) introduce 300 words and books 1–9 (grades 4–12) 3,000 words, all with exercises. [1]
There is one count that puts the English vocabulary at about 1 million words—but that count presumably includes words such as Latin species names, prefixed and suffixed words, scientific terminology, jargon, foreign words of extremely limited English use and technical acronyms. [43] [44] [45] Urdu: 264,000