## fractionA rational number that represents a part, or several equal parts, of a whole; examples include one-half, two-thirds, and three-fifths. The word comes from the Latin frangere, meaning
"to break." A simple, common, or vulgar fraction is of
the form a/b, where a (the numerator) may be
any integer and b (the denominator)
may be any integer greater than 0. If a < b, the fraction
is said to be proper ("bottom heavy"); otherwise it is
improper ("top heavy"). A decimal
fraction has a denominator of 10, 100, 1000, etc. In an algebraic fraction, the denominator, or the numerator and denominator, are algebraic expressions, for example x/(x^{2} + 2). In a composite fraction, both the numerator and denominator are themselves fractions. Two fractions a/b and c/d can be added, subtracted, multiplied, and divided according to the rules:
## Related entry• continued fraction## Related category• TYPES OF NUMBERS | |||||

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