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  2. Vigesimal - Wikipedia

    en.wikipedia.org/wiki/Vigesimal

    20 20 is equivalent to forty in decimal = (2 × 20 1) + (0 × 20 0) D0 20 is equivalent to two hundred and sixty in decimal = (13 × 20 1) + (0 × 20 0) 100 20 is equivalent to four hundred in decimal = (1 × 20 2) + (0 × 20 1) + (0 × 20 0). In the rest of this article below, numbers are expressed in decimal notation, unless specified ...

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    [14] [15] It is said to be an improper fraction, or sometimes top-heavy fraction, [16] if the absolute value of the fraction is greater than or equal to 1. Examples of proper fractions are 2/3, −3/4, and 4/9, whereas examples of improper fractions are 9/4, −4/3, and 3/3.

  4. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    20 (twenty) is the natural number following 19 and preceding 21. A group of twenty units is sometimes referred to as a score. [1] [2] ... (The metric equivalent is 6/6.)

  5. Unit fraction - Wikipedia

    en.wikipedia.org/wiki/Unit_fraction

    A Hilbert matrix is a square matrix in which the elements on the th antidiagonal all equal the unit fraction / . That is, it has ... [20] Adjacency and Ford circles

  6. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    For example, ⁠ 1 / 4 ⁠, ⁠ 5 / 6 ⁠, and ⁠ −101 / 100 ⁠ are all irreducible fractions. On the other hand, ⁠ 2 / 4 ⁠ is reducible since it is equal in value to ⁠ 1 / 2 ⁠, and the numerator of ⁠ 1 / 2 ⁠ is less than the numerator of ⁠ 2 / 4 ⁠. A fraction that is reducible can be reduced by dividing both the numerator ...

  7. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    For example, 0.24999... equals 0.25, exactly as in the special case considered. These numbers are exactly the decimal fractions, and they are dense. [41] [9] Second, a comparable theorem applies in each radix (base). For example, in base 2 (the binary numeral system) 0.111... equals 1, and in base 3 (the ternary numeral system) 0.222

  8. One half - Wikipedia

    en.wikipedia.org/wiki/One_half

    ← 0 10 20 30 40 50 60 70 80 90 ... It is an irreducible fraction with a numerator of 1 and a ... Multiplication by one half is equivalent to division by two, or ...

  9. Rational number - Wikipedia

    en.wikipedia.org/wiki/Rational_number

    In mathematics, "rational" is often used as a noun abbreviating "rational number". The adjective rational sometimes means that the coefficients are rational numbers. For example, a rational point is a point with rational coordinates (i.e., a point whose coordinates are rational numbers); a rational matrix is a matrix of rational numbers; a rational polynomial may be a polynomial with rational ...