place the bar over the first set of repeating numbers. for example,
1.345673456734567... would be written as 1.34567 with a bar over the "34567".
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decimal and repeating bar
A repeating decimal is usually shown with a bar over the decimal that is repeated
With two thirds, you can put the bar anywhere, as long as its after the decimal point, of course. It would be simpler to put it over the 6 in the tenths place.
It is: 5.'63' repeating '63'
Vinculum