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A pie chart showing the percentage by web browser visiting Wikimedia sites (April 2009 to 2012) In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [1] although the abbreviations pct., pct, and sometimes pc are also used. [2]
Year 100 was a leap year starting on Wednesday of the Julian calendar. The denomination 100 for this year has been used since the early medieval period.
In some peculiar instances runic numbers have been used as numerals in a base ten positional system, replacing the Arabic numerals. It is unknown if this use existed before the 19th century. The oldest authenticated use of this notation is in the notes of an 18 year-old journeyman tailor, Edward Larsson, that are dated to 1885 in pentadic runes.
[16] [19] The apothecaries' system has its own system of notation, in which the units symbol or abbreviation is followed by the quantity in lower case Roman numerals. [17] [19] [20] For amounts less than one, the quantity is written as a fraction, or for one half, ss (or variations such as ss., ṡṡ, or s̅s̅).
Tokapu means 24, tokapu talu means 24 × 2 = 48, and tokapu tokapu means 24 × 24 = 576. Ngiti is reported to have a base-32 number system with base-4 cycles. [45] The Ndom language of Papua New Guinea is reported to have base-6 numerals. [52] Mer means 6, mer an thef means 6 × 2 = 12, nif means 36, and nif thef means 36×2 = 72.
A typical clock face with Roman numerals in Bad Salzdetfurth, Germany. The notion of a twelve-hour day dates to the Roman Empire. Roman numerals continued as the primary way of writing numbers in Europe until the 14th century, when they were largely replaced in common usage by Hindu–Arabic numerals.
The 2, 8, and 9 resemble Arabic numerals more than Eastern Arabic numerals or Indian numerals. Leonardo Fibonacci was a Pisan mathematician who had studied in the Pisan trading colony of Bugia , in what is now Algeria , [ 15 ] and he endeavored to promote the numeral system in Europe with his 1202 book Liber Abaci :
1011 = the largest n such that 2 n contains 101 and does not contain 11011, Harshad number in bases 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 (and 202 other bases), number of partitions of 1 into reciprocals of positive integers <= 16 Egyptian fraction [11]