ratinonal numbers can repeat as long we can see the repeating part with a line over it (called a vinculum)
rational numbers can be written in form a/b where b is not equal zero
1.33333333333333 is repeating, it is 4/3
3.1415... is obviously an attempt to represent pi or π, the most famous irrational number
5.25 is easy, 5.25/1 or 525/100
0.6666666666666=2/3
the answer is 3.141592...