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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. 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).

  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. 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. Seventh-day Adventist Commentary Reference Series - Wikipedia

    en.wikipedia.org/wiki/Seventh-day_Adventist...

    t. e. The Seventh-day Adventist Commentary Reference Series is a set of volumes produced primarily by Seventh-day Adventist scholars, and designed for both scholarly and popular level use. It includes the seven-volume Seventh-day Adventist Bible Commentary, the two-volume Seventh-day Adventist Encyclopedia, as well as the single volumes Seventh ...

  7. Ancient Egyptian multiplication - Wikipedia

    en.wikipedia.org/.../Ancient_Egyptian_multiplication

    In mathematics, ancient Egyptian multiplication (also known as Egyptian multiplication, Ethiopian multiplication, Russian multiplication, or peasant multiplication), one of two multiplication methods used by scribes, is a systematic method for multiplying two numbers that does not require the multiplication table, only the ability to multiply and divide by 2, and to add.

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