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The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.
Stockton, A.M. (1823) [Reprinted 1839], "Cloth Measure", The Western Calculator, or a New and Compendious System of Practical Arithmetic; containing the Elementary Principals and Rules of Calculation in Whole, Mixed, and Decimal Numbers Arranged, Defined, and Illustrated, in a Plain and Natural Order; Adapted to the Use of Schools, throughout ...
Also, some fractions (such as 1 ⁄ 7, which is 0.14285714285714; to 14 significant figures) can be difficult to recognize in decimal form; as a result, many scientific calculators are able to work in vulgar fractions or mixed numbers.
These latter two slots are for mixed-base math, a development unique to the Roman hand abacus [5] described in following sections. The longer slot with five beads below the Ө position allowed for the counting of 1/12 of a whole unit called an uncia (from which the English words inch and ounce are derived), making the abacus useful for Roman ...
"A Solar Calculator, a Game Ball, and a Cheerleader's Bosom" ... "Demons, Sunday School, and Prime Numbers" Howie Deutch: Story by : ... producing mixed feelings in ...
The only numeric data type was the integer; floating-point numbers were not supported. Using integers allowed numbers to be stored in a compact 16-bit format that could be more rapidly read and processed than the 32- or 40-bit floating-point formats found in most BASICs of the era.
The first truly pocket-sized electronic calculator was the Busicom LE-120A "HANDY", the first single-chip calculator to be built, released in February 1971. [112] The Busicom 141-PF desktop calculator, released in March 1971, was the first computing machine to use a microprocessor , the 4-bit Intel 4004 (co-designed by Busicom's Masatoshi Shima ).