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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    8 5 (Take the last digit of the number, and check if it is 0 or 5) 8 5 (If it is 5, ... This method can be simplified by removing the need to multiply. All it would ...

  3. UNIFAC - Wikipedia

    en.wikipedia.org/wiki/UNIFAC

    In statistical thermodynamics, the UNIFAC method (UNIQUAC Functional-group Activity Coefficients) [1] is a semi-empirical system for the prediction of non-electrolyte activity in non-ideal mixtures. UNIFAC uses the functional groups present on the molecules that make up the liquid mixture to calculate activity coefficients. By using ...

  4. Karnaugh map - Wikipedia

    en.wikipedia.org/wiki/Karnaugh_map

    A Karnaugh map (KM or K-map) is a diagram that can be used to simplify a Boolean algebra expression. Maurice Karnaugh introduced it in 1953 [1] [2] as a refinement of Edward W. Veitch's 1952 Veitch chart, [3] [4] which itself was a rediscovery of Allan Marquand's 1881 logical diagram [5] [6] (aka. Marquand diagram [4]).

  5. Explicit and implicit methods - Wikipedia

    en.wikipedia.org/wiki/Explicit_and_implicit_methods

    Explicit methods calculate the state of a system at a later time from the state of the system at the current time, while implicit methods find a solution by solving an equation involving both the current state of the system and the later one.

  6. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216. Similarly, by adding instead of subtracting, the same methods can be used to multiply by 11 and 12, respectively (although simpler methods to multiply by 11 exist).

  7. I Ching divination - Wikipedia

    en.wikipedia.org/wiki/I_Ching_divination

    As is the case for the conventional two-coin method and the four coin method, the simplified two-coin method can be boiled down to binary numbers, simply interpreting any H as 1 and any T as 0. Then, old yin takes value of 0000 (0 in decimal numbers), unchanging yin values between 0001 and 0111 (1 to 7), unchanging yang those between 1000 and ...

  8. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Examples include ⁠ 1 / 2 ⁠, − ⁠ 8 / 5 ⁠, ⁠ −8 / 5 ⁠, and ⁠ 8 / −5 ⁠. The term was originally used to distinguish this type of fraction from the sexagesimal fraction used in astronomy. [10] Common fractions can be positive or negative, and they can be proper or improper (see below).

  9. Q9 input method - Wikipedia

    en.wikipedia.org/wiki/Q9_input_method

    The Q9 input method (Chinese: 九方輸入法), invented by Qcode Information Technology Ltd. of Hong Kong, is an input method that uses only the number keys on a numeric keypad to input Chinese characters into a digital device.