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2. The 5.6.7.8's - Wikipedia

   en.wikipedia.org/wiki/The_5.6.7.8's

   The 5.6.7.8's music draws from multiple genres of American music, including rock and roll, surf, rockabilly, doo-wop, punk rock [4] and psychobilly. [5] According to Yoshiko "Ronnie" Fujiyama, the band wanted to "deconstruct rock 'n' roll into punk music by using distortion and noise and screaming."

3. 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 ...

4. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   With enough practice this method can be done in your head. ... In this same way the tables for subtracting digits from 10 or 9 are to be memorized. ... 7+7=14 6+6=12 ...

5. Band matrix - Wikipedia

   en.wikipedia.org/wiki/Band_matrix

   Band matrices are usually stored by storing the diagonals in the band; the rest is implicitly zero. For example, a tridiagonal matrix has bandwidth 1. The 6-by-6 matrix. is stored as the 6-by-3 matrix. A further saving is possible when the matrix is symmetric. For example, consider a symmetric 6-by-6 matrix with an upper bandwidth of 2:

6. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   Let us look at a simple multiplication: 5 × 7 = 35, (3 + 5 = 8). Now consider (7 + 9) × 5 = 16 × 5 = 80, (8 + 0 = 8) or 7 × (9 + 5) = 7 × 14 = 98, (9 + 8 = 17), (1 + 7 = 8). Any non-negative integer can be written as 9×n + a, where 'a' is a single digit from 0 to 8, and 'n' is some non-negative integer. Thus, using the distributive rule ...

7. Vedic square - Wikipedia

   en.wikipedia.org/wiki/Vedic_square

   Vedic square. In Indian mathematics, a Vedic square is a variation on a typical 9 × 9 multiplication table where the entry in each cell is the digital root of the product of the column and row headings i.e. the remainder when the product of the row and column headings is divided by 9 (with remainder 0 represented by 9).