irrational number

A number that cannot be expressed as a repeating or terminating decimal
 

Example:

square root of 2 = 1.414213562...

 

repeating decimal

A decimal in which one or more digits repeat endlessly

 

Examples:

0.333..., or 0.3 with a line on top of the 3

 

terminating decimal

A decimal that ends; a decimal for which the division operation results in a remainder of zero

 

Examples:

5/8 = 0.625

 

 

 

 

 

http://www.harcourtschool.com/glossary/math_advantage/glossary8.html