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2. Pascal's calculator - Wikipedia

   en.wikipedia.org/wiki/Pascal's_calculator

   Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]

3. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   Mechanical calculator from 1914 An Addiator can be used for addition and subtraction. Two different classes of mechanisms had become established by this time, reciprocating and rotary. The former type of mechanism was operated typically by a limited-travel hand crank; some internal detailed operations took place on the pull, and others on the ...

4. Stepped reckoner - Wikipedia

   en.wikipedia.org/wiki/Stepped_reckoner

   It was the first calculator that could perform all four basic arithmetic operations. [3] Its intricate precision gearwork, however, was somewhat beyond the fabrication technology of the time; mechanical problems, in addition to a design flaw in the carry mechanism, prevented the machines from working reliably. [4] [5]

5. Curta - Wikipedia

   en.wikipedia.org/wiki/Curta

   The nines' complement math breakthrough eliminated the significant mechanical complexity created when "borrowing" during subtraction. This drum was the key to miniaturizing the Curta. His work on the pocket calculator stopped in 1938 when the Nazis forced him and his company to concentrate on manufacturing precision instruments for the German ...

6. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   Pascal's calculator could add and subtract two numbers directly and thus, if the tedium could be borne, multiply and divide by repetition. Schickard's machine, constructed several decades earlier, used a clever set of mechanised multiplication tables to ease the process of multiplication and division with the adding machine as a means of ...

7. How to Calculate a Business Owner’s Salary - AOL

   www.aol.com/finance/calculate-business-owner...

   Calculate your net income. ... This step is crucial to avoid debt or even bankruptcy. First, subtract the cost of your business’s expenses (such as employees’ salaries, rent for your office ...

8. Windows Calculator - Wikipedia

   en.wikipedia.org/wiki/Windows_Calculator

   A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.

9. How to calculate your home equity — and how much of it you ...

   www.aol.com/finance/calculate-home-equity...

   Step 1: Estimate your home’s value. Calculating equity starts with identifying the property’s market value. You can find out how much your home is worth using a number of methods. Online home ...