There are an infinite number of them. Here are a few:
2.1 2.2 2.3 2.3000000001 2.30000000000000006 2.5 2.00009 . . etc.
How to find them:
You probably never heard this before, but I'll bet you'll remember it from now on:
<em>ANY number that you can write down on paper completely, </em><em>using digits and a decimal point if you need it but no symbols, is a rational number.</em>
If you can write it down completely without any 'comments', then it's rational.
