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A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or , where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include 1 2 , − 8 5 , −8 5 , and 8 −5 .
The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way Galaxy. [1][2][3] The equation was formulated in 1961 by Frank Drake, not for purposes of quantifying the number of civilizations, but as a way to stimulate scientific dialogue at the first ...
episodes. Cyberchase is an animated mathematics series that currently airs on PBS Kids. The show revolves around three Earth children (Jackie, Matt, and Inez) who use mathematics and problem-solving skills to save Cyberspace from a villain known as The Hacker. The three are transported into Cyberspace by Motherboard, the ruler of this virtual ...
The smallest base in which all fractions 1 / 2 to 1 / 18 have periods of 4 or shorter. 23: Kalam language, [45] Kobon language [citation needed] 24: Quadravigesimal [46] 24-hour clock timekeeping; Greek alphabet; Kaugel language. 25: Sometimes used as compact notation for quinary. 26: Hexavigesimal [46] [47]
A graphical or bar scale. A map would also usually give its scale numerically ("1:50,000", for instance, means that one cm on the map represents 50,000cm of real space, which is 500 meters) A bar scale with the nominal scale expressed as "1:600 000", meaning 1 cm on the map corresponds to 600,000 cm=6 km on the ground.
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of ...
t. e. The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.
150 BC – China, Negative numbers appear in the Chinese text The Nine Chapters on the Mathematical Art. 150 BC – 75 BC – Phoenician, Zeno of Sidon. 190 BC – 120 BC – Greece, Hipparchus develops the bases of trigonometry. 190 BC – 120 BC – Greece, Hypsicles. 160 BC – 100 BC – Greece, Theodosius of Bithynia.
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