It used to be a line or bar drawn above the digits, which repeat. But other answers to a similar question suggest that it is a small circle ° above the digit.
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4 over (or divided by) 18 is a fraction which is equal to 0.2... (where "..." indicates that the "2" is recurring; i.e. there are an infinite number of 2's after the decimal point). (Note: there is a special symbol to indicate that a digit is recurring but, as far as I am aware, it is not possible to use it on this website.)
8/30 = 0.266... recurring.8/30 = 0.266... recurring.8/30 = 0.266... recurring.8/30 = 0.266... recurring.
34/60 = 0.566... recurring.34/60 = 0.566... recurring.34/60 = 0.566... recurring.34/60 = 0.566... recurring.
0.33333 recurring = 33.333% recurring
3.535353 is a recurring decimal.