Improper fraction

An improper fraction, also called a top-heavy fraction in Britain, is a fraction whose absolute value is greater than 1. For example, $\displaystyle \frac 7 3$ is an improper fraction. Fractions which are not improper are called proper fractions.

Improper fractions may be used as a counting system, and can also be used in cryptography. See improper fractional base.

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See also