These numbers, such as pi, are known as trancendentalnumbers, because they represent a value that is not the solution of an algebraic equation or a quotient using real numbers.
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Either terminating (as in 0.25) or non-terminating as in the expression for pi.
To show a repeating decimal you put a dot above the digit that repeats.
As written it is a terminating decimal. However, if the digits 123456789101112 keep on repeating after the amount written (normally it would be written with a dot over the first 1 and the last 2; as that is impossible here, to show repeating an ellipsis (three dots) could be used, as in: 0.123456789101112123456789101112... to show that it goes on) then it is a repeating decimal.
when converting a fraction to a decimal, some of the answers will be repeating decimals. A bar or line is sometimes placed over the part of the decimal that keeps repeating. ex: 0.24242424 etc. can be written as 0.24 with a 'bar' over the 24 to show that it keeps repeating.
1/3 is .3333 repeating forever. To get this you divide 1 by 3.