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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    95 x 97 ---- Last two digits: 100-95=5 (subtract first number from 100) 100-97=3 (subtract second number from 100) 5*3=15 (multiply the two differences) Final Product- yx15 First two digits: 100-95=5 (Subtract the first number of the equation from 100) 97-5=92 (Subtract that answer from the second number of the equation) Now, the difference ...

  3. Arithmometer - Wikipedia

    en.wikipedia.org/wiki/Arithmometer

    The arithmometer (French: arithmomètre) was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. This calculator could add and subtract two numbers directly and could perform long multiplications and divisions effectively by using a movable accumulator for the result.

  4. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

  5. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    This is now on display in Derby Museum and Art Gallery. From 1767 to 1833, the British Nautical Almanac and Astronomical Ephemeris tabulated the equation of time in the sense 'add or subtract (as directed) the number of minutes and seconds stated to or from the apparent time to obtain the mean time'. Times in the Almanac were in apparent solar ...

  6. Lindsey Vonn ending retirement, returning to skiing and U.S ...

    www.aol.com/sports/lindsey-vonn-ending...

    Nothing is sure for Vonn right now. She's getting back into skiing and trying to keep her expectations low, but she is Lindsey Vonn. She made her World Cup debut at age 16 and has never been shy ...

  7. She called him Uncle Chris. Now he's being executed for her ...

    www.aol.com/news/she-called-him-uncle-chris...

    Rowan Ford was a star student whose smile and work ethic won the hearts of her teachers. She loved riding her purple bicycle and her bedroom was Barbie pink.

  8. College Football Playoff: Making the national championship ...

    www.aol.com/sports/college-football-playoff...

    Despite playing in the first round, Texas is now the co-favorite to win it all thanks to a defense that gives up 12.5 points a game; it is the stingiest in the country against the pass. Opposing ...

  9. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    Treating a month as 30 days and a year as 360 days was devised for its ease of calculation by hand compared with manually calculating the actual days between two dates. Also, because 360 is highly factorable, payment frequencies of semi-annual and quarterly and monthly will be 180, 90, and 30 days of a 360-day year, meaning the payment amount ...