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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...

   9:28: Flight 93 is hijacked above northern Ohio, turning to the southeast. 9:37:46: Flight 77 crashes into the western side of The Pentagon. All 58 passengers and crew are killed aboard the aircraft including an additional 125 (including emergency workers) on the ground. The crash starts a violent fire.

4. 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 ...

5. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   To "cast out nines" from a single number, its decimal digits can be simply added together to obtain its so-called digit sum. The digit sum of 2946, for example is 2 + 9 + 4 + 6 = 21. Since 21 = 2946 − 325 × 9, the effect of taking the digit sum of 2946 is to "cast out" 325 lots of 9 from it. If the digit 9 is ignored when summing the digits ...

6. Sieve of Eratosthenes - Wikipedia

   en.wikipedia.org/wiki/Sieve_of_Eratosthenes

   In mathematics, the sieve of Eratosthenes is an ancient algorithm for finding all prime numbers up to any given limit. It does so by iteratively marking as composite (i.e., not prime) the multiples of each prime, starting with the first prime number, 2. The multiples of a given prime are generated as a sequence of numbers starting from that ...

7. Outline of the September 11 attacks - Wikipedia

   en.wikipedia.org/wiki/Outline_of_the_September...

   Planning of the September 11 attacks. On the morning of September 11, 2001, 19 al-Qaeda terrorists hijacked four commercial passenger jet airliners, intentionally crashing two into the World Trade Center in New York City. The hijackers crashed a third airliner into the Pentagon. The fourth plane crashed in a field near Shanksville, Pennsylvania.