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To show a repeating decimal you put a dot above the digit that repeats.
Count the number of digits in the repeating part and put it over that number of nines eg 17.3 repeater, there is only one repeating digit so put the 3 over one 9 and you get 1/3 or 1.142857142857 there are 6 digits in the repeating part so 142857/999999 = 1/7
You have to put that because if you cut the number off by not putting it there, you are not showing how the number keeps going. To have the number be more accurate, you should put in the repeating number symbol.
115/99
Some people use an ellipsis, some people put a line over the repeating part, some people write the word "repeating" or "recurring."