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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Subtracting 2 times the last digit from the rest gives a multiple of 3. (Works because 21 is divisible by 3) 405: 40 - 5 x 2 = 40 - 10 = 30 = 3 x 10 4: The last two digits form a number that is divisible by 4. [2] [3] 40,832: 32 is divisible by 4. If the tens digit is even, the ones digit must be 0, 4, or 8.

  3. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    The smaller numbers, for use when subtracting, are the nines' complement of the larger numbers, which are used when adding. In mathematics and computing , the method of complements is a technique to encode a symmetric range of positive and negative integers in a way that they can use the same algorithm (or mechanism ) for addition throughout ...

  4. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    There is also a tens-carry indicator and a control to set the machine to zero. The machine can: add or subtract an 8-digit number to/from a 16-digit number, multiply two 8-digit numbers to get a 16-digit result, divide a 16-digit number by an 8-digit divisor. Addition or subtraction is performed in a single step, with a turn of the crank.

  5. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    A subtraction problem such as is solved by borrowing a 10 from the tens place to add to the ones place in order to facilitate the subtraction. Subtracting 9 from 6 involves borrowing a 10 from the tens place, making the problem into +. This is indicated by crossing out the 8, writing a 7 above it, and writing a 1 above the 6.

  6. Doctors Say This Viral "Sleep Rule" Actually Works - AOL

    www.aol.com/lifestyle/doctors-viral-sleep-rule...

    The numbers reference each step to take throughout the day to get more restful sleep. The concept leans heavily on common sense and what we know about physiological processes.

  7. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Subtraction of numbers 0–10. Line labels = minuend. X axis = subtrahend. Y axis = difference. Subtraction is usually written using the minus sign "−" between the terms; that is, in infix notation. The result is expressed with an equals sign. For example, = (pronounced as "two minus one equals one")

  8. ‘This Is Not A Love Story’ by Huffington Post

    testkitchen.huffingtonpost.com/this-is-not-a...

    A scary, sobering look at fatal domestic violence in the United States

  9. Best CD rates today: Protect your money from holiday spending ...

    www.aol.com/finance/best-cd-rates-today-protect...

    The FDIC is an independent government agency charged with maintaining stability and public confidence in the U.S. financial system and providing insurance on consumer deposit accounts.

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