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2. Pinwheel calculator - Wikipedia

   en.wikipedia.org/wiki/Pinwheel_calculator

   Turn the wheels one way and one performs an addition, the other way a subtraction. As part of a redesign of the arithmometer , [ 1 ] they reduced by an order of magnitude the cost and the size of mechanical calculators on which one could easily do the four basic operations (add, subtract, multiply and divide).

3. Pascal's calculator - Wikipedia

   en.wikipedia.org/wiki/Pascal's_calculator

   10: 8 x 10 + 20 + 12: The second wheel from the right has a wheel with 10 spokes contained in a fixed wheel with 20 segments. This could be attributed to a bad restoration. Léon Parcé collection: France: Surveying: 8: 5 x 10 + 6 + 12 + 12 This machine was bought as a broken music box in a French antique shop in 1942. IBM collection [23] USA

4. Slide chart - Wikipedia

   en.wikipedia.org/wiki/Slide_chart

   A circular slide chart is sometimes referred to as a wheel chart or volvelle. Unlike other hand-held mechanical calculating devices such as slide rules and addiators, which have been replaced by electronic calculators and computer software, wheel charts and slide charts have survived to the present time. There are a number of companies who ...

5. Grubhub to pay $25 million for misleading customers ... - AOL

   www.aol.com/news/grubhub-pay-25-million...

   (Reuters) -Grubhub settled with the U.S. Federal Trade Commission and Illinois Attorney General Kwame Raoul on Tuesday for allegedly misleading customers about order fees, adding restaurants to ...

6. Wheel theory - Wikipedia

   en.wikipedia.org/wiki/Wheel_theory

   A diagram of a wheel, as the real projective line with a point at nullity (denoted by ⊥). A wheel is a type of algebra (in the sense of universal algebra) where division is always defined. In particular, division by zero is meaningful. The real numbers can be extended to a wheel, as can any commutative ring.

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   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.