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  2. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    If the given number is in decimal and the target base is duodecimal, the method is same. Using the digit conversion tables: (decimal) 10,000 + 2,000 + 300 + 40 + 5 + 0.6 = (duodecimal) 5,954 + 1,1A8 + 210 + 34 + 5 + 0; 7249. To sum these partial products and recompose the number, the addition must be done with duodecimal rather than decimal ...

  3. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    The base "Roman fraction" is S, indicating 1 ⁄ 2. The use of S (as in VIIS to indicate 7 1 ⁄ 2 ) is attested in some ancient inscriptions [ 45 ] and also in the now rare apothecaries' system (usually in the form SS ): [ 44 ] but while Roman numerals for whole numbers are essentially decimal , S does not correspond to 5 ⁄ 10 , as one might ...

  4. Balanced ternary - Wikipedia

    en.wikipedia.org/wiki/Balanced_ternary

    Some balanced ternary fractions have multiple representations too. For example, ⁠ 1 / 6 ⁠ = 0.1 𝖳 bal3 = 0.0 1 bal3. Certainly, in the decimal and binary, we may omit the rightmost trailing infinite 0s after the radix point and gain a representations of integer or terminating fraction.

  5. Senary - Wikipedia

    en.wikipedia.org/wiki/Senary

    Like the decimal base 10, the base is a semiprime, though it is unique as the product of the only two consecutive numbers that are both prime (2 and 3). As six is a superior highly composite number , many of the arguments made in favor of the duodecimal system also apply to the senary system.

  6. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  7. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63] For instance, pH is the decimal cologarithm of the activity of hydronium ions (the form hydrogen ions H + take in water). [64] The activity of hydronium ions in neutral water is 10 −7 mol·L −1, hence a pH of 7. Vinegar typically ...

  8. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    To calculate a percentage of a percentage, convert both percentages to fractions of 100, or to decimals, and multiply them. For example, 50% of 40% is: ⁠ 50 / 100 ⁠ × ⁠ 40 / 100 ⁠ = 0.50 × 0.40 = 0.20 = ⁠ 20 / 100 ⁠ = 20%. It is not correct to divide by 100 and use the percent sign at the same time; it would literally imply ...