In excel there is way to round numbers to significant digit that adapts to the size of the number being rounded. The following is the formula for it
What is the survey 123 equivalent for ABS and INT in excel?
(Using formula explanation from this site >> https://exceljet.net/formula/round-a-number-to-n-significant-digits)
Unfortunately Survey123 doesn't have an out of the box ABS function available, but there is a workaround. Please check out Ismael's comment on another post that discusses the workaround.
For the INT function, Survey123 has support for an int() function, please check out the XLSForm Formulas documentation for more information.