When you display the value of a number variable in a text box, Articulate Storyline automatically rounds it to two decimal places. For example, if a learner enters .059 in a numeric entry field, it'll display as .06 in any variable references you've added to the course.
Similarly, if you're using variables to perform calculations and displaying the results in a text box, they'll be rounded to two decimal places.
To learn more about data-entry fields and variable references, click here. To learn about number variables, click here.