I have a field of type text that contains a number like 10. I want to create a search form with views exposed filters. Since the field is a text, I can't use greater than and less than operators on the field. Is there any way to have such operators for a text field?
You'll want to create a different field of type "number" for that.
You might be able to do something like creating using Computed Field to create a new field that takes the value of your original field and changes it to an integer with
$num = (int)$str;