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rational number

A number that can be written as a fraction

irrational numbers

Numbers that cannot be expressed as a ratio of two integers. Their decimal expansions are nonending and nonrepeating.

terminating decimal

A decimal number that ends or terminates

repeating decimal

A decimal that repeats a digit or group of digits forever.

proper fraction

a fraction with a numerator smaller than the denominator

improper fraction

a fraction whose numerator is larger than the denominator

mixed fraction

a whole number and a fraction

bar notation

In repeating decimals, the line or bar placed over the digits that repeat.

reciprocal

flip the fraction