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  2. Medieval weights and measures - Wikipedia

    en.wikipedia.org/wiki/Medieval_weights_and_measures

    The best-attested of these is the perch, which varied in length from 10 to 25 feet, with the most common value (16 1 ⁄ 2 feet or 5.03 m) remaining in use until the twentieth century. [ 1 ] Later development of the English system continued in 1215 in the Magna Carta. [ 2 ]

  3. History of mathematical notation - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematical...

    In this system, equations are written in full sentences. For example, the rhetorical form of + = is "The thing plus one equals two" or possibly "The thing plus 1 equals 2". [citation needed] The ancient Egyptians numerated by hieroglyphics.

  4. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept). In archaeology and anthropology , prehistory is subdivided into the three-age system , this list includes the use of the three-age system as well as a number of various designation used in reference to sub-ages within the ...

  5. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    Only two sets of possible ages add up to the same totals: A. 2 + 6 + 6 = 14 B. 3 + 3 + 8 = 14. In case 'A', there is no 'eldest child': two children are aged six (although one could be a few minutes or around 9 to 12 months older and they still both be 6). Therefore, when told that one child is the eldest, the census-taker concludes that the ...

  6. List of obsolete units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_obsolete_units_of...

    Spat – a unit of length equal to 1,000,000,000 km (620,000,000 mi) Stadion; Step; Unglie; Vara – an Aragonese, Spanish, and Portuguese unit [3] Yojana – a Vedic measure of distance used in ancient India. Its value was about 10 km (6.2 mi), although the exact value is disputed among scholars (between 8 and 13 km or 5 and 8 mi)

  7. Wikipedia:Manual of Style/Mathematics - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/...

    Pages for logged out editors learn more. Contributions; ... 0 and 1 are allowed to be equal. Elliptic functions are written in ... 5.2 cm); non-metric units ...

  8. Equality (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Equality_(mathematics)

    The first use of an equals sign, equivalent to + = in modern notation. From The Whetstone of Witte (1557) by Robert Recorde. Recorde's introduction of =."And to avoid the tedious repetition of these words: "is equal to" I will set as I do often in work use, a pair of parallels, or twin lines of one [the same] length, thus: ==, because no 2 things can be more equal." [5]

  9. History of measurement - Wikipedia

    en.wikipedia.org/wiki/History_of_measurement

    The present stone is 14 pounds (~6.35 kg), but an earlier unit appears to have been 16 pounds (~7.25 kg). The other units were multiples of 2, 8, and 160 times the stone, or 28, 112, and 2240 pounds (~12.7 kg, 50.8 kg, 1016 kg), respectively. The hundredweight was approximately equal to two talents.