When you convert a fraction to a decimal sometimes the decimal repeats forever. For example 1/3 as a decimal = 0.333333333.... (or 0.3 "recurring"). Another example is 1/7=0.142857142857.... (or 0.142857 recurring).
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A repeating decimal is one in after the decimal point,
the same digit or group of digits repeats forever.
No, no repeating decimal is irrational. All repeating decimals can be converted to fractions. They are, however, non-terminating.
The bar is only used for repeating decimals. If it is repeating, you can use it.
Repeating Decimal can be expressed exactly using what
A repeating decimal is just a decimal that repeats. An example would be 6.575757... Repeating decimals are infinite.
.333333 (repeating)