In common usage a fraction is any part of a unit.

In mathematics:

• A vulgar fraction is a rational number written as one integer (the numerator) divided by a non-zero integer (the denominator). The line that separates the numerator and the denominator is called the vinculum. Sub-categories of the vulgar fraction include:
  • irreducible fraction: a vulgar fraction "in lowest terms", where the numerator is an integer, the denominator is a positive integer, and the highest common factor of the numerator and the denominator is 1;
  • proper fraction: a vulgar fraction with a value between zero and one;
  • improper fraction: a vulgar fraction with a value greater than 1;
  • unit fraction: a vulgar fraction with a numerator of 1;
  • Egyptian fraction: the sum of distinct unit fractions;
  • decimal fraction: a vulgar fraction where the denominator is a power of ten;
  • dyadic fraction: a vulgar fraction in which the denominator is a power of two.
• A mixed fraction: A mixed fraction is an integer plus a proper fraction.
• A continued fraction is an expression such as:

where the a_i are positive integers.

• A compound fraction is a fraction where the numerator or denominator (or both) contain fractions.
• Partial fractions can be used to decompose a rational function.
• An irrational fraction is, if all fractions must be capable of being expressed as a vulgar fraction, a contradiction in terms. An irrational number is, by definition, not rational i.e. it cannot be expressed as a vulgar fraction.

In religion:

• In some Christian denominations, the Fraction is the ceremonial act of breaking the bread during Communion.

External links

• Curricula for Teaching about Fractions http://www.ericdigests.org/2000-2/fractions.htm
• Teaching Fractions: New Methods, New Resources http://www.ericdigests.org/2004-1/fractions.htm
• Worksheets: Identifying Fractions http://www.kwiznet.com/p/takeQuiz.php?ChapterID=1551&CurriculumID=4&Method=Works
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• Worksheets: Improper Fractions to Mixed Numbers http://www.kwiznet.com/p/takeQuiz.php?ChapterID=1364&CurriculumID=4&Method=Works
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• Curricula for Teaching about Equivalent Fractions http://www.math-lessons.ca