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  2. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    He also gave two other approximations of π: π ≈ 22 ⁄ 7 and π ≈ 355 ⁄ 113, which are not as accurate as his decimal result. The latter fraction is the best possible rational approximation of π using fewer than five decimal digits in the numerator and denominator. Zu Chongzhi's results surpass the accuracy reached in Hellenistic ...

  3. 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 ...

  4. Grading systems by country - Wikipedia

    en.wikipedia.org/wiki/Grading_systems_by_country

    In primary education, fractions of grades are identified with a + or −, which signifies a quarter (converted to either 0.8 or 0.3 if only one decimal place is used). Thus, a grade of 6.75 (or 6.8) could be written as 7−, whereas a grade of 7+ would count for 7.25 or 7.3.

  5. Usage share of web browsers - Wikipedia

    en.wikipedia.org/wiki/Usage_share_of_web_browsers

    This bias is caused by the differences in the percentage of tracked hits in the sample, and the percentage of global usage tracked by third party sources. This difference is caused by the heavier levels of market usage. [13] Statistics from the United States government's Digital Analytics Program (DAP) do not represent world-wide usage patterns ...