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jacobwang0910
Rational numbers have are wither self terminating, or if they are non terminating, then they have a pattern. 
Irrational numbers are non terminating and have no pattern.
a rational number is a number that can be written in a ratio of two integers. ex: 8 is rational because it can be written as 8/1, .001 is rational because it can be written as 1/1000.
an irrational number cannot be expressed as a ratio. ex: the number pi (3.145.....) is is not a simple fraction 
hope it helps :)