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  2. Serial sevens - Wikipedia

    en.wikipedia.org/wiki/Serial_sevens

    Each subtraction is considered as a unit and calculations are made on the basis of the 14 possible correct subtractions, that is 100-93-86-79-72-65-58-51-44-37-30-23-16-9-2. [ 2 ] Similar tests include serial threes where the counting downwards is done by threes, reciting the months of the year in reverse order, or spelling 'world' backwards.

  3. Memory span - Wikipedia

    en.wikipedia.org/wiki/Memory_span

    In a backward digit span task, the procedure is largely the same, except that subjects being tested are asked to recall the digits in backward order (e.g., if presented with the following string of numbers "1 5 9 2 3," the subject would be asked to recall the digits in reverse order; in the case, the correct response would be "3 2 9 5 1").

  4. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Instead of finding the difference digit by digit, one can count up the numbers between the subtrahend and the minuend. [18] Example: 1234 − 567 = can be found by the following steps: 567 + 3 = 570; 570 + 30 = 600; 600 + 400 = 1000; 1000 + 234 = 1234; Add up the value from each step to get the total difference: 3 + 30 + 400 + 234 = 667.

  5. Arithmomania - Wikipedia

    en.wikipedia.org/wiki/Arithmomania

    Other examples include counting tiles on the floor or ceiling, the number of lines on the highway, or touching things a certain number of times such as a door knob or a table. Arithmomania sometimes develops into a complex system in which the person assigns values or numbers to people, objects and events in order to deduce their coherence.

  6. Backward induction - Wikipedia

    en.wikipedia.org/wiki/Backward_induction

    Limited backward induction also influences how regularly free-riding occurs within a team's public goods game. Early on, when the effects of limited backward induction are low, free riding is less frequent, whilst towards the end, when effects are high, free-riding becomes more frequent.

  7. Reverse mathematics - Wikipedia

    en.wikipedia.org/wiki/Reverse_mathematics

    Reverse mathematics is a program in mathematical logic that seeks to determine which axioms are required to prove theorems of mathematics. Its defining method can briefly be described as "going backwards from the theorems to the axioms", in contrast to the ordinary mathematical practice of deriving theorems from axioms.

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    Ad-Free AOL Mail offers you the AOL webmail experience minus paid ads, allowing you to focus on your inbox without distractions, for just $4.99 per month. Get Ad-Free AOL Mail Get a more ...

  9. Word count - Wikipedia

    en.wikipedia.org/wiki/Word_count

    The word count is the number of words in a document or passage of text. Word counting may be needed when a text is required to stay within certain numbers of words. This may particularly be the case in academia, legal proceedings, journalism and advertising. Word count is commonly used by translators to

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