it means repeat those decimals forever.
example:
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4.56 = 4.56565656565656565656565656........
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If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7
if used in a decimal it means that the number it is over is repeating ex) 27.33333333333333 instead you could write 27.3 with a line over the 3
It means that 6 is a recurring decimal such as 0.16666...recurring 6
Either, the decimal with a line over what's repeating (eg. 0.6 with a line over it), or decimal repeating (eg. "point six repeating").
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