0.2 a repeating decimal into a fraction = 2/9
0.6666 repeating = 2/3
0.999 repeating = 1 (the integer).
Just have a go.
sexx
56/99
It is 2/3.
If you convert repeating decimals into a fraction, you see that the repeating decimals are rational.
998/999
123/999
0.3333 repeating
998/999