How would you help someone remember the
difference between rational and irrational numbers?

Question

How would you help someone remember the
difference between rational and irrational numbers?

agent0smith · Answer

Rational numbers you can write as fractions, they are also terminating decimals or repeating decimals (ie they end, or repeat the same numbers forever)... 
eg 2/3,    5/8,    566/233,    0.14471,    9.9872,     8.2323232323... (notice the 23 repeats)

Irrationals can not be written as fractions, and are non-terminating non-repeating decimals (they go on forever and have no pattern that repeats)
eg. 2.38728759181...,      square root of 2,    square root of 3,   pi,    0.237898119446...