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  2. Kaprekar's routine - Wikipedia

    en.wikipedia.org/wiki/Kaprekar's_routine

    As an example, starting with the number 8991 in base 10: 9981 – 1899 = 8082 8820 – 0288 = 8532 8532 – 2358 = 6174 7641 – 1467 = 6174. 6174, known as Kaprekar's constant, is a fixed point of this algorithm. Any four-digit number (in base 10) with at least two distinct digits will reach 6174 within seven iterations. [3]

  3. MTD Holdings - Wikipedia

    en.wikipedia.org/wiki/MTD_Holdings

    In 1958 MTD entered the lawn and garden power equipment industry with the production of an 18-inch (46 cm) power rotary mower. In 1959 MTD began manufacturing self-propelled lawn mowers, garden tractors and other power equipment. In 1962 MTD purchased Sehl Engineering Ltd. of Canada which would later become MTD Products, Ltd. and then MTD Canada.

  4. Round-off error - Wikipedia

    en.wikipedia.org/wiki/Round-off_error

    When there is a tie, the floating-point number whose last stored digit is even (also, the last digit, in binary form, is equal to 0) is used. For IEEE standard where the base β {\displaystyle \beta } is 2 {\displaystyle 2} , this means when there is a tie it is rounded so that the last digit is equal to 0 {\displaystyle 0} .

  5. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    This system detects all single-digit errors and around 90% [citation needed] of transposition errors. 1, 3, 7, and 9 are used because they are coprime with 10, so changing any digit changes the check digit; using a coefficient that is divisible by 2 or 5 would lose information (because 5×0 = 5×2 = 5×4 = 5×6 = 5×8 = 0 modulo 10) and thus ...

  6. Briggs & Stratton - Wikipedia

    en.wikipedia.org/wiki/Briggs_&_Stratton

    A higher power 7-HP model was made (Engine Model# 84330) for use in heavier duty machines such as the single stage Snow Commander (2001–2008) and 2 stage Power Max 726TE/6000 (2004–2008); the extra horsepower was obtained using transfer ports in the piston and cylinder wall, and this model ran at the same operating speed as the 6.5 hp ...

  7. Mercury KG-7Q Super 10 Hurricane - Wikipedia

    en.wikipedia.org/wiki/Mercury_KG-7Q_Super_10...

    When the dealer installed the quicksilver driveshaft housing and gear case (packaged at $82.25) he had authorization to hand stamp a small "Q" behind the serial numbers on the tag and block. Some did, some did not – and so, the "Stamped Q" came to be. 1951 saw the first production race-ready outboard models; KG-4Q, KG7-Q, and KG-9Q.

  8. Napier's bones - Wikipedia

    en.wikipedia.org/wiki/Napier's_bones

    The others hold the multiples of the single, namely twice the single, three times the single and so on up to the ninth square containing nine times the number in the top square. Single-digit numbers are written in the bottom right triangle leaving the other triangle blank, while double-digit numbers are written with a digit on either side of ...

  9. Hundred-dollar, Hundred-digit Challenge problems - Wikipedia

    en.wikipedia.org/wiki/Hundred-dollar,_Hundred...

    The Hundred-dollar, Hundred-digit Challenge problems are 10 problems in numerical mathematics published in 2002 by Nick Trefethen . A $100 prize was offered to whoever produced the most accurate solutions, measured up to 10 significant digits. The deadline for the contest was May 20, 2002.