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  2. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The result appears in the accumulator windows. Repeated subtractions are done similarly except the multiplier dial turns in the opposite direction, so a second set of digits, in red, are used. To perform a single addition or subtraction, the multiplier is simply set at one. To multiply by numbers over 9: The multiplicand is set into the operand ...

  3. Scott Flansburg - Wikipedia

    en.wikipedia.org/wiki/Scott_Flansburg

    Scott Flansburg (born December 28, 1963) is an American dubbed "The Human Calculator" and listed in the Guinness Book of World Records for speed of mental calculation.He is the annual host and ambassador for The National Counting Bee, a math educator, and media personality.

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Another method is to simply multiply the number by 10, and add the original number to the result. For example: 17 × 11 17 × 10 = 170 170 + 17 = 187 17 × 11 = 187 One last easy way: If one has a two-digit number, take it and add the two numbers together and put that sum in the middle, and one can get the answer.

  5. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    One called the Touch Magic was "no bigger than a pack of cigarettes" according to Administrative Management. [45] The first Soviet Union made pocket-sized calculator, the Elektronika B3-04 [46] was developed by the end of 1973 and sold at the start of 1974. One of the first low-cost calculators was the Sinclair Cambridge, launched in August ...

  6. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    In wanting to know of any capital, at a given yearly percentage, in how many years it will double adding the interest to the capital, keep as a rule [the number] 72 in mind, which you will always divide by the interest, and what results, in that many years it will be doubled. Example: When the interest is 6 percent per year, I say that one ...

  7. Would You Rather Have a Penny Doubled Every Day for a Month ...

    www.aol.com/finance/rather-penny-doubled-every...

    You can just use a compound interest calculator to figure out how fast your money can grow. ... You would sacrifice more than $5 million dollars in a month for $1 million today. Of course, you ...

  8. Missing Girl, 17, Who Reportedly Left Home After Family ... - AOL

    www.aol.com/missing-girl-17-reportedly-left...

    Jennaleah “Jenna” Hin, 17, of Henderson, Nevada, was reported missing since Dec. 30 after she reportedly left home following a family dispute

  9. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [1] [2] [3] On an expression or formula calculator, one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression.