in Hot Potatoes JQuiz you can give more than one predicted answer and then specify the score for each answer. If you make the score for all your predicted answers 100%, then any of them will be judged to be a correct answer ... I think.
It doesn't quite capture the essence of the issue that I think you are trying to solve which is to ignore trailing zeros, or more generally to use only a certain number of significant decimal places, or maybe even accept any answer within a given range. I believe the numeric question type in the Moodle question bank can handle those concepts more elegantly, but unfortunately there is no corresponding editor in Hot Potatoes, so you would have to import them using a different format, e.g. GIFT. The Hot Potatoes programs are more suitable for text-based exercises.
Here are some help docs: