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  2. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

  3. Timeline for the day of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_for_the_day_of...

    8:46:40: Flight 11 crashes into the north face of the North Tower (1 WTC) of the World Trade Center, between floors 93 and 99. All passengers aboard are instantly killed with an unknown number inside the building. The aircraft enters the tower intact. [1] 8:50–8:54 (approx.): Flight 77 is hijacked above southern Ohio, turning to the southeast ...

  4. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Ukrainian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

  5. Timeline of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_September...

    8:42–8:46: United States airspace Flight 175 is hijacked. 8:46:40: North Tower, World Trade Center, New York City, New York: Flight 11 crashes into the North Tower of the World Trade Center between the 93rd and 99th floors. 8:50–8:54: United States airspace Flight 77 is hijacked. 9:03:02 [48] South Tower, World Trade Center, New York City ...

  6. Mnemonic - Wikipedia

    en.wikipedia.org/wiki/Mnemonic

    Each knuckle represents a 31-day month. A mnemonic device (/ nɪˈmɒnɪk / nih-MON-ik) [1] or memory device is any learning technique that aids information retention or retrieval in the human memory, often by associating the information with something that is easier to remember. It makes use of elaborative encoding, retrieval cues and imagery ...

  7. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    For 8-bit integers the table of quarter squares will have 2 91=511 entries (one entry for the full range 0..510 of possible sums, the differences using only the first 256 entries in range 0..255) or 2 91=511 entries (using for negative differences the technique of 2-complements and 9-bit masking, which avoids testing the sign of ...

  8. American Airlines Flight 11 - Wikipedia

    en.wikipedia.org/wiki/American_Airlines_Flight_11

    American Airlines Flight 11 was a domestic passenger flight that was hijacked by five al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks. The hijacked airliner was deliberately crashed into the North Tower of the World Trade Center complex in New York City, killing everyone still alive aboard the ...

  9. Piphilology - Wikipedia

    en.wikipedia.org/wiki/Piphilology

    Piphilology comprises the creation and use of mnemonic techniques to remember many digits of the mathematical constant π. The word is a play on the word "pi" itself and of the linguistic field of philology. There are many ways to memorize π, including the use of piems (a portmanteau, formed by combining pi and po em), which are poems that ...

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