Some people use an ellipsis, some people put a line over the repeating part, some people write the word "repeating" or "recurring."
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for example if the decimal is 6.6 then to make it a repeating decimal you have to write it with a line on top of the .6 thats repeating
0.72 repeating written as a decimal is 0.72 repeating
repeating decimal 1.1 as a fraction = 10/9
You could write it as 88.9 with the 9 repeating.
0.5454 repeating