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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For example, to say that 14 × 15 was 201 would be unreasonable. Since 15 is a multiple of 5, the product should be as well. Likewise, 14 is a multiple of 2, so the product should be even. Furthermore, any number which is a multiple of both 5 and 2 is necessarily a multiple of 10, and in the decimal system would end with a 0. The correct answer ...

  3. Desmos - Wikipedia

    en.wikipedia.org/wiki/Desmos

    Some 50 employees joined Amplify. Desmos Studio was spun off as a separate public benefit corporation focused on building calculator products and other math tools. [7] In May 2023, Desmos released a beta for a remade Geometry Tool. In it, geometrical shapes can be made, as well as expressions from the normal graphing calculator, with extra ...

  4. e (mathematical constant) - Wikipedia

    en.wikipedia.org/wiki/E_(mathematical_constant)

    The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function.It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted .

  5. iPhone - Wikipedia

    en.wikipedia.org/wiki/IPhone

    iPhone 15 / 15 Plus iOS 17.0 September 22, 2023 () current: latest iOS: 1 year, 5 months Current or still sold iPhone 15 Pro / 15 Pro Max iOS 17.0 September 22, 2023 () September 9, 2024 () current: latest iOS: 1 year, 5 months 5 months: Discontinued, still supported iPhone 16 / 16 Plus iOS 18.0