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 Irrational Number:  A number whose decimal form is nonterminating and nonrepeating. Irrational numbers cannot be written in the form a/b, where a and b are integers (b cannot be zero). So all numbers that are not rational are irrational.

More Number Games: Many more games with numbers.

Ask Dr. math: Scroll down and learn more about irrational numbers.

Rational or Irrational: Learn more about the difference between rational and irrational numbers.

Types of Numbers: Learn about all types of numbers.