Respuesta :

richechik
 think it is because it is a number that terminates (meaning it doesnt go on and on forever)
AL2006
-- Because it can be written as the ratio of two whole numbers.
Like this ===>  9/10 

-- Because it can be written down completely using only digits
and a decimal point or fraction bar.
Like this ===>   0.9  or  9/10 .