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that dot means reccurent, its usually above a decimal number, & means that digit continues on forever.

E.g. put 1/3 as a decimal.

this wouldn't be 0.3 it would be 0.3 (with the dot above the 3)

so for the example above the answer is 0.333333333333333333333333333(continues on forever)

By the way, the number can have a dot on more than one of its digits

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Q: What does a point over a number mean in mathematics?
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