In the formula questions, you can select the number of decimal points a number should have, but in the preview of the generated solutions it will display with fewer decimal points if there are trailing zeros.  For example a variable set to a range of 1-10 with 1 decimal point might display as 3 instead of 3.0. The actual quiz question seems to render the variables with the proper number of decimal points, but not the preview.   If you are being careful with significant digits, this can lead to concern that your intent might not be properly conveyed in the question.   I'd like it to force the number in the preview to have the specified number of digits, padding with zeros if necessary, as it does when rendering the actual question in the quiz.