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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. Twelve Tables - Wikipedia

   en.wikipedia.org/wiki/Twelve_Tables

   v. t. e. The Laws of the Twelve Tables (Latin: lex duodecim tabularum) was the legislation that stood at the foundation of Roman law. Formally promulgated in 449 BC, the Tables consolidated earlier traditions into an enduring set of laws. [1][2] In the Forum, "The Twelve Tables" stated the rights and duties of the Roman citizen.

4. School timetable - Wikipedia

   en.wikipedia.org/wiki/School_timetable

   Empty timetable sheet showing time slot allocations. A school timetable is a calendar that coordinates students and teachers within the classrooms and time periods of the school day. Other factors include the class subjects and the type of classrooms available (for example, science laboratories). Since the 1970s, researchers in operations ...

5. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   The following table lists the first 1000 primes, with 20 columns of consecutive primes in each of the 50 rows. ... 12 p − 1 ≡ 1 ... All prime numbers from 31 to ...

6. Multiplication sign - Wikipedia

   en.wikipedia.org/wiki/Multiplication_sign

   The multiplication sign (×), also known as the times sign or the dimension sign, is a mathematical symbol used to denote the operation of multiplication, which results in a product. [ 1 ] The symbol is also used in botany , in botanical hybrid names and the heavy goods vehicle industry, to calculate the amount of powered wheels.

7. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   Piano key frequencies. This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1][2] Every octave is made of twelve steps called semitones. A ...