they are called repeating decimals.
Some non-terminating decimals are repeating decimals.
Irrational number or repeating decimal
They are called terminating decimals.
The decimal that never stops is called recurring decimal. For example - 1/3 = 0.3333... and goes on. Such decimals are written with a dot or bar on top of the numbers which are repeating.
a decimal that repeats is called a repeating decimal
The line over a repeating decimal is called the vinculum.
It is a recurring or a repeating decimal
a repeating decimal
They are called rational numbers