Fractions
As soon as systems of weights and measures were devised, units were subdivided into smaller units: pounds were divided into ounces, pounds into shillings and pence. Beyond the smallest units, there was a need to use vulgar fractions to represent even smaller quantities. In systems such as the degrees-minutes-seconds system, it is possible to represent one second of arc, equal to
of a circle.
Read more about this topic: Small Number
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