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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. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    For higher rates, a larger numerator would be better (e.g., for 20%, using 76 to get 3.8 years would be only about 0.002 off, where using 72 to get 3.6 would be about 0.2 off). This is because, as above, the rule of 72 is only an approximation that is accurate for interest rates from 6% to 10%.

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

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

    For many people who choose $1 million over the penny that doubles, it might be that they cannot easily comprehend how a single penny can grow into more than $5 million in a month–and more than ...

  5. 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.

  6. 8 Real Ways To Multiply Your Money - AOL

    www.aol.com/finance/8-real-ways-multiply-money...

    Invest on the Stock Exchange. One of the best ways to multiply your money is to invest it on the stock exchange, said Adam Wood, co-founder of Revenue Geeks. "Since 2000, the S&P 500, a leading ...

  7. How to retire on less than $1 million and never run out of money

    www.aol.com/finance/retire-less-1-million-never...

    To be sure, $1 million may not be enough if you intend to spend lavishly. However, some retirees may be able to get by on $30,000 in income, in which case you may not need $1 million in order to ...

  8. Littlewood's law - Wikipedia

    en.wikipedia.org/wiki/Littlewood's_law

    Littlewood’s law of miracles states that in the course of any normal person’s life, miracles happen at a rate of roughly one per month. The proof of the law is simple. During the time that we are awake and actively engaged in living our lives, roughly for 8 hours each day, we see and hear things happening at a rate of about one per second.

  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.