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  2. Decimal calendar - Wikipedia

    en.wikipedia.org/wiki/Decimal_calendar

    The French Republican Calendar was introduced (along with decimal time) in 1793, and was similar to the ancient Egyptian calendar. [3] It consisted of twelve months, each divided into three décades of ten days, with five or six intercalary days called sansculottides. [3] The calendar was abolished by Napoleon on January 1, 1806. [3]

  3. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Likewise, 14 is a multiple of 2, so the product should be even. Furthermore, any number which is a multiple of both 5 and 2 is necessarily a multiple of 10, and in the decimal system would end with a 0. The correct answer is 210. It is a multiple of 10, 7 (the other prime factor of 14) and 3 (the other prime factor of 15).

  4. Milü - Wikipedia

    en.wikipedia.org/wiki/Milü

    An easy mnemonic helps memorize this fraction by writing down each of the first three odd numbers twice: 1 1 3 3 5 5, then dividing the decimal number represented by the last 3 digits by the decimal number given by the first three digits: 1 1 3 分之(fēn zhī) 3 5 5. (In Eastern Asia, fractions are read by stating the denominator first ...

  5. French Republican calendar - Wikipedia

    en.wikipedia.org/wiki/French_Republican_calendar

    Each day in the Republican Calendar was divided into ten hours, each hour into 100 decimal minutes, and each decimal minute into 100 decimal seconds. Thus an hour was 144 conventional minutes (2.4 times as long as a conventional hour), a minute was 86.4 conventional seconds (44% longer than a conventional minute), and a second was 0.864 ...

  6. Long division - Wikipedia

    en.wikipedia.org/wiki/Long_division

    Decimal numbers are not divided directly, the dividend and divisor are multiplied by a power of ten so that the division involves two whole numbers. Therefore, if one were dividing 12,7 by 0,4 (commas being used instead of decimal points), the dividend and divisor would first be changed to 127 and 4, and then the division would proceed as above.

  7. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    A decimal calendar is a calendar which includes units of time based on the decimal system. The French Republican Calendar was introduced (along with decimal time) in 1793. [6] It consisted of twelve months, each divided into three décades of ten days, with five or six intercalary days called sansculottides. [6]

  8. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    Sometimes in official records, decimal hours were divided into tenths, or décimes, instead of minutes. One décime is equal to 10 decimal minutes, which is nearly equal to a quarter-hour (15 minutes) in standard time. Thus, "five hours two décimes" equals 5.2 decimal hours, roughly 12:30 p.m. in standard time.

  9. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Take each digit of the number (371) in reverse order (173), multiplying them successively by the digits 1, 3, 2, 6, 4, 5, repeating with this sequence of multipliers as long as necessary (1, 3, 2, 6, 4, 5, 1, 3, 2, 6, 4, 5, ...), and adding the products (1×1 + 7×3 + 3×2 = 1 + 21 + 6 = 28). The original number is divisible by 7 if and only if ...