Right now the math calculations round to zero after seven zeros (e.g., .00000001). So 1/1e8 = .00000001 but 1/1e9 = 0.
I do not think there probably needs to be a description of the problem, but if there does, the calculator reports incorrect results in certain circumstances.
Thank you for your good work.
Probably, the responses should shift over to just expressing the values in terms of e after some point. Like 1/1e8 = .0000001 but 1/1e9 = .1e9. But just calling it 0 is not helpful.