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  2. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Minor aspects of the presentation are adjustable, for example the cards can be dealt either face-up or face-down. If they are dealt face-down then the spectator must look through each of the piles until finding which one contains the selected card, whereas if they are dealt face-up then an attentive spectator can immediately answer the question of which pile contains the selected card.

  3. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    By using a dot to divide the digits into two groups, one can also write fractions in the positional system. For example, the base 2 numeral 10.11 denotes 1×2 1 + 0×2 0 + 1×2 −1 + 1×2 −2 = 2.75. In general, numbers in the base b system are of the form:

  4. Flashcard - Wikipedia

    en.wikipedia.org/wiki/Flashcard

    Flashcards specifically exercise the mental process of active recall: given a question, one must produce the correct answer.However, many have raised several questions regarding optimal usage of flashcards: how does one precisely use them, how frequently does one review, and how does one react to errors, either complete failures to recall or partial mistakes?

  5. Mathematical instrument - Wikipedia

    en.wikipedia.org/wiki/Mathematical_instrument

    Animation of construction of a pentagon using a compass and straightedge. A mathematical instrument is a tool or device used in the study or practice of mathematics.In geometry, construction of various proofs was done using only a compass and straightedge; arguments in these proofs relied only on idealized properties of these instruments and literal construction was regarded as only an ...

  6. Women in India - Wikipedia

    en.wikipedia.org/wiki/Women_in_India

    The status of women in India has been subject to many great changes over the past few millennia. With a decline in their status from the ancient to medieval times ...

  7. Luke 11 - Wikipedia

    en.wikipedia.org/wiki/Luke_11

    Luke 11 is the eleventh chapter of the Gospel of Luke in the New Testament of the Christian Bible. It records Luke 's version of the Lord's Prayer and several parables and teachings told by Jesus Christ . [ 1 ]