What about repeating decimals? Those are decimals in which a digit or group of digits repeats indefinitely. You might not think it at first, but all repeating decimals are rational, too.
1
3
​3
​
​1
​​ is a ratio of integers. You probably know that as a decimal,
1
3
​3
​
​1
​​ repeats. It looks like this:

0
.
3
‾
0.
​3
​
​​

Even this crazy number is rational:
0
.
0
3
4
4
8
2
7
5
8
6
2
0
6
8
9
6
5
5
1
7
2
4
1
3
7
9
3
1
‾
0.
​0344827586206896551724137931
​
​​

It is exactly equal to
1
2
9
​29
​
​1
​​ and that's a ratio of integers.

Not all real numbers are rational. Any number that can’t be written as a ratio of integers is an irrational number.

0
.
1
‾
0.
​1
​
​​ is a(n)
A
integer.
B
rational number.
C
irrational number.
D
terminating decimal.