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.
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To show a repeating decimal you put a dot above the digit that repeats.
No, 125 is not a repeating decimal. A repeating decimal is a decimal number that has a repeating pattern of digits after the decimal point. In the case of 125, it is a whole number and does not have any decimal places or repeating patterns. It can be written as 125.0000, but it is still a non-repeating decimal.
No, 33 is an integer. 0.3333 repeating is a repeating decimal.
It appears to be a repeating decimal
0.72 repeating written as a decimal is 0.72 repeating