onetwelfth

One twelfth, written as 1/12 and often read as one-twelfth, is a fraction representing one part when a whole is divided into twelve equal parts. It is a rational number and the reciprocal of twelve. In decimal form it equals approximately 0.083333..., with the digit 3 repeating indefinitely. The fraction is in lowest terms, since 1 and 12 have no common divisor greater than 1.

In measurement and everyday use, one twelfth appears in several common divisions. One twelfth of a foot is one inch, because a foot comprises twelve inches. One twelfth of a day is two hours, and one twelfth of a circle is 30 degrees. One twelfth of an inch is about 2.1167 millimeters. These conversions illustrate how a single fraction can link different unit systems and scales.

In arithmetic, 1/12 behaves like any simple fraction. It can be added to other fractions by finding a common denominator, and it can be multiplied across numerators and denominators. For example, 1/12 + 1/4 equals 1/3, and 6 × 1/12 equals 1/2.

Geometrically, twelve equal sectors divide a circle into a dodecagon when considering central angles; each sector subtends a 30-degree angle. In finance, monthly calculations often use a nominal rate divided by 12, reflecting one-twelfth of a yearly period. Thus, the concept of one twelfth appears across mathematics, measurement, geometry, and practical applications.

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