8 Answers

Hi,
For this question, you need to realize that a rational number is one that can be expressed as a/b where 'a' and 'b' are integers.
Therefore, 1/9 is expressed as a/b where a = 1 and b = 9 which makes this a rational number.
I hope that helps you out! Please let me know if you have any other questions!

Yes.
A rational number is any number that can be expressed as the ratio of two integers.
1 is an integer, and 9 is an integer, so 1/9 is rational. (Hence the "ratio" part of the word).
By the way, any number with a repeating decimal sequence can be expressed as a ratio of two integers, and is thus rational.
Hope that helps!

YES.
Any number in the form p/q, where p and q are coprimes (that is they don't have
any common factor between them) and q not equal to zero is called a rational number;
Here p = 1, and q = 9, which is not zero as well there are no common factors between 1 and 9;
Hence it is a rational number.
Further if you consider its decimal form, it is
0.111111111111
which is nonterminating recurring decimal.
Any decimal representation, which is either terminating or nonterminating repeating decimal representation, then they are called rational numbers. So by this way also it is a rational number.

I have seen that on a thermometer in Minnesota. Its a rational number with an irrational comfort level.

yes, because it has a repeating pattern of digits. Also, by definition, a rational number is any number that can be expressed as an integer over another integer. Both 1 and 9 are integers.
EDIT:
By the way, could someone please explain to me why my comment was given three thumbs down?

yes
0.11111111... is a reacquiring decimal and therefor it is a rational number.

yes

YES