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  2. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Fractions such as 1 ⁄ 3 are displayed as decimal approximations, for example rounded to 0.33333333. Also, some fractions (such as 1 ⁄ 7, which is 0.14285714285714; to 14 significant figures) can be difficult to recognize in decimal form; as a result, many scientific calculators are able to work in vulgar fractions or mixed numbers.

  3. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  4. Metrication in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    The decimal nature of these units and of the device made it easy to calculate the area of a rectangle of land in acres and decimal fractions of an acre. [5] Having difficulties in communicating with German scientists, the Scottish inventor James Watt, in 1783, called for the creation of a global decimal measurement system. [6]

  5. Science and technology of the Han dynasty - Wikipedia

    en.wikipedia.org/wiki/Science_and_technology_of...

    Although the decimal system existed in China since the Shang dynasty (c. 1600 – c. 1050 BCE), the earliest evidence of a decimal fraction (i.e. the denominator is a power of ten) is an inscription on a standard volume-measuring vessel dated 5 CE and used by the mathematician and astronomer Liu Xin (46 BCE – 23 CE). [89]

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