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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Another method is to simply multiply the number by 10, and add the original number to the result. For example: 17 × 11 17 × 10 = 170 170 + 17 = 187 17 × 11 = 187 One last easy way: If one has a two-digit number, take it and add the two numbers together and put that sum in the middle, and one can get the answer.

  3. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    In arbitrary-precision arithmetic, it is common to use long multiplication with the base set to 2 w, where w is the number of bits in a word, for multiplying relatively small numbers. To multiply two numbers with n digits using this method, one needs about n 2 operations.

  4. Lattice multiplication - Wikipedia

    en.wikipedia.org/wiki/Lattice_multiplication

    A grid is drawn up, and each cell is split diagonally. The two multiplicands of the product to be calculated are written along the top and right side of the lattice, respectively, with one digit per column across the top for the first multiplicand (the number written left to right), and one digit per row down the right side for the second multiplicand (the number written top-down).

  5. Karatsuba algorithm - Wikipedia

    en.wikipedia.org/wiki/Karatsuba_algorithm

    Since the additions, subtractions, and digit shifts (multiplications by powers of B) in Karatsuba's basic step take time proportional to n, their cost becomes negligible as n increases. More precisely, if T(n) denotes the total number of elementary operations that the algorithm performs when multiplying two n-digit numbers, then

  6. List of South Korean idol groups - Wikipedia

    en.wikipedia.org/wiki/List_of_South_Korean_idol...

    Idol musical bands in South Korea started to appear after the success of Seo Taiji and Boys, whose debut in 1992 is considered a turning point in the history of Korean popular music. [1] [2] 2012 was a record year in K-pop in terms of number of rookie artists: 33 male groups and 38 girl groups debuted. [3] [4]

  7. Persistence of a number - Wikipedia

    en.wikipedia.org/wiki/Persistence_of_a_number

    In mathematics, the persistence of a number is the number of times one must apply a given operation to an integer before reaching a fixed point at which the operation no longer alters the number. Usually, this involves additive or multiplicative persistence of a non-negative integer, which is how often one has to replace the number by the sum ...

  8. Multiplicative digital root - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_digital_root

    There are also additional restrictions on the first two digits. Based on these restrictions, the number of candidates for -digit numbers with record-breaking persistence is only proportional to the square of , a tiny fraction of all possible -digit numbers. However, any number that is missing from the sequence above would have multiplicative ...

  9. RBW (company) - Wikipedia

    en.wikipedia.org/wiki/RBW_(company)

    RBW (Korean: 알비더블유; an acronym for Rainbow Bridge World) is a South Korean entertainment company founded by Kim Jin-woo (김진우) and Kim Do-hoon (김도훈). [ 3 ] [ 4 ] The company has multiple subsidiaries, including DSP Media , WM Entertainment , Urban Works Media , and the IP management company Contents X. [ 5 ]