201 would go into the Three significant category because the number 201 has three Spears numbers that mean something. .4 would be in the one significant because there is only one number that means something. However, 0.4 would also go into the one category because the 0 in 0.4 doesn’t mean anything. If you were to wright it as .4 instead of 0.4, they would mean the same thing.
