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  2. 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 ...

  3. Napier's bones - Wikipedia

    en.wikipedia.org/wiki/Napier's_bones

    If the tables are held on single-sided rods, 40 rods are needed in order to multiply 4-digit numbers – since numbers may have repeated digits, four copies of the multiplication table for each of the digits 0 to 9 are needed. If square rods are used, the 40 multiplication tables can be inscribed on 10 rods.

  4. Percival G. Spencer - Wikipedia

    en.wikipedia.org/wiki/Percival_G._Spencer

    Edward Spencer, a solicitor, was a friend and trusted assistant of the noted balloonist Charles Green, [2] ascending with Green 27 times and soloing 40 times. [1] Charles Spencer founded the balloon manufacturing firm of C. G. Spencer & Sons. [1] All five of Percival's siblings also followed the family profession. [1]

  5. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Tagged PDF is not required in situations where a PDF file is intended only for print. Since the feature is optional, and since the rules for tagged PDF were relatively vague in ISO 32000-1, support for tagged PDF among consuming devices, including assistive technology (AT), is uneven as of 2021. [ 32 ]

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Download as PDF; Printable version; ... Babylonian mathematicians employed multiplication tables. ... 40: 3 90: 12: and then add the entries. ...

  7. Trump, 78, notched a 54% approval rating, one of his all-time highest, compared to about 46% who disapprove of him, an Emerson College poll found. Biden, 82, scored a 36% approval to 52% ...

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