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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    With x=2 and y=3 for example, by positioning the top scale to start at the bottom scale's 2, the result of the multiplication 3×2=6 can then be read on the bottom scale under the top scale's 3: While the above example lies within one decade, users must mentally account for additional zeroes when dealing with multiple decades.

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Download as PDF; Printable version; ... perform the same procedure as in a multiplication, only backwards. 8x4=32 which is 5, 5+3 = 8. And 8=8. ... Toggle the table ...

  4. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/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 arithmetic operations ...

  5. Exercise book - Wikipedia

    en.wikipedia.org/wiki/Exercise_book

    Traditionally, the inside back cover contains a table of the weights and measures of the English system printed for reference; however, this feature has become less common in countries that have adopted the metric system. Sometimes a multiplication table, or grammar or punctuation tips, are also found on the inside back cover. The inside front ...

  6. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    Multiplication is a mathematical operation of repeated addition. When two numbers are multiplied, the resulting value is a product. The numbers being multiplied are multiplicands, multipliers, or factors. Multiplication can be expressed as "five times three equals fifteen," "five times three is fifteen," or "fifteen is the product of five and ...

  7. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    It requires memorization of the multiplication table for single digits. This is the usual algorithm for multiplying larger numbers by hand in base 10. A person doing long multiplication on paper will write down all the products and then add them together; an abacus-user will sum the products as soon as each one is computed.