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  2. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    If the ratio consists of only two values, it can be represented as a fraction, in particular as a decimal fraction. For example, older televisions have a 4:3 aspect ratio, which means that the width is 4/3 of the height (this can also be expressed as 1.33:1 or just 1.33 rounded to two decimal places). More recent widescreen TVs have a 16:9 ...

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Decimal fractions are commonly expressed using decimal notation in which the implied denominator is determined by the number of digits to the right of a decimal separator, the appearance of which (e.g., a period, an interpunct (·), a comma) depends on the locale (for examples, see Decimal separator). Thus, for 0.75 the numerator is 75 and the ...

  4. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    In order to convert a rational number represented as a fraction into decimal form, one may use long division. For example, consider the rational number ⁠ 5 / 74 ⁠: 0.0 675 74 ) 5.00000 4.44 560 518 420 370 500 etc. Observe that at each step we have a remainder; the successive remainders displayed above are 56, 42, 50.

  5. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    Then, supposing by induction that the decimal fraction has been defined for <, one defines as the largest digit such that + /, and one sets = + /. One can use the defining properties of the real numbers to show that x is the least upper bound of the D n . {\displaystyle D_{n}.}

  6. Rounding - Wikipedia

    en.wikipedia.org/wiki/Rounding

    Approximating a fraction by a fractional decimal number: 5 / 3 1.6667: 4 decimal places: Approximating a fractional decimal number by one with fewer digits 2.1784: 2.18 2 decimal places Approximating a decimal integer by an integer with more trailing zeros 23217: 23200: 3 significant figures Approximating a large decimal integer using ...

  7. Brix - Wikipedia

    en.wikipedia.org/wiki/Brix

    The critical angle (the angle beyond which light is totally reflected back into the sample) is a function of the refractive index and the operator detects this critical angle by noting where a dark-bright boundary falls on an engraved scale. The scale can be calibrated in Brix or refractive index.

  8. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    Fractions such as ⁠ 22 / 7 ⁠ and ⁠ 355 / 113 ⁠ are commonly used to approximate π, but no common fraction (ratio of whole numbers) can be its exact value. [21] Because π is irrational, it has an infinite number of digits in its decimal representation, and does not settle into an infinitely repeating pattern of digits.

  9. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    A larger number indicates higher or steeper degree of "tilt". Often slope is calculated as a ratio of "rise" to "run", or as a fraction ("rise over run") in which run is the horizontal distance (not the distance along the slope) and rise is the vertical distance.