If a number has the same repeating number after the decimal what is it called or what do you put at the end.

It's common to put a overline above the repeating digits.  For example

 

\(0.\bar{3} = 0.33333\dots \\ 5.1234234257\overline{9715} = 5.1234234257971597159715\dots\)

Thanks Rom,

 

Decimals that have one digit or a series of digits repeating at the end are called repeating or recurring decimals.

Decimals with a definite end digit are called terminating decimals

 

In Australia we use a slightly different convention

 

\(0.333333... is\; written\; as \;\;0.\dot3\\ and\\ 0.07658658658.... is\;written\;as\;\;\;0.07\dot65\dot8\)

 

 

Other counties do it slightly differently again.   

I do not think it has been standardized yet.  :)

 

It is like the decimal point you most likely use.  Some countries use a comma instead :)