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What is a decimal in which a digit or a group of digits repeats without end?
It is a repeating decimal.
A decimal number in which a digit or group of digits repeats without end?
a decimal in which a digit or group of digits repeats without end
Do you put repeating sign over 6.667?
To show a repeating decimal you put a dot above the digit that repeats.
Can a fraction be expressed as a repeating number?
I assume you mean "repeating decimal". Yes. For example, 1/6 = 0.166666... after that, the digit "6" repeats over and over again. In other cases, it is more than one digit that repeats, over and over. Note that at first there may be other digits, that don't repeat later on.In general, any fraction (with integers on top and bottom), if converted into a decimal, will eventually start repeating. Conversely, any repeating decimal can be converted into a fraction.
How do you determine if a decimal is rational or not?
A decimal is a rational number if it ever ends, or if it repeats the same single digit or set of digits forever.
