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23 percent written as a fraction is 23/100. For math help, visit www.math.com .

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In mathematics, a **continued fraction** is an expression obtained through an iterative process of representing a number as the sum of its integer part and the reciprocal of another number, then writing this other number as the sum of *its* integer part and another reciprocal, and so on. In a **finite continued fraction** (or **terminated continued fraction**), the iteration/recursion is terminated after finitely many steps by using an integer in lieu of another continued fraction. In contrast, an **infinite continued fraction** is an infinite expression. In either case, all integers in the sequence, other than the first, must be positive. The integers a_{i} are called the coefficients or terms of the continued fraction.

Continued fractions have a number of remarkable properties related to the Euclidean algorithm for integers or real numbers. Every rational number *p*/*q* has two closely related expressions as a finite continued fraction, whose coefficients a_{i} can be determined by applying the Euclidean algorithm to (*p*, *q*). The numerical value of an infinite continued fraction will be irrational; it is defined from its infinite sequence of integers as the limit of a sequence of values for finite continued fractions. Each finite continued fraction of the sequence is obtained by using a finite prefix of the infinite continued fraction's defining sequence of integers. Moreover, every irrational number α is the value of a *unique* infinite continued fraction, whose coefficients can be found using the non-terminating version of the Euclidean algorithm applied to the incommensurable values α and 1. This way of expressing real numbers (rational and irrational) is called their *continued fraction representation*.

When calculating the unstable fraction of the radioactivity in the original isotope nucleus, there is a simple equation which can help you find the fraction of unstable nuclei still radioactive after a given period of half-lives.

In aerospace engineering, an aircraft's **fuel fraction**, **fuel weight fraction**, or a spacecraft's **propellant fraction**, is the weight of the fuel or propellant divided by the gross take-off weight of the craft (including propellant):

The fractional result of this mathematical division is often expressed as a percent. For aircraft with external drop tanks, the term **internal fuel fraction** is used to exclude the weight of external tanks and fuel.

**Mathematics**
**Elementary arithmetic** is the simplified portion of arithmetic which includes the operations of addition, subtraction, multiplication, and division.

Elementary arithmetic starts with the natural numbers and the written symbols (digits) which represent them. The process for combining a pair of these numbers with the four basic operations traditionally relies on memorized results for small values of numbers, including the contents of a multiplication table to assist with multiplication and division.

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