In Prime 3.0 (I don't have 3.1 yet), the reason your Example B doesn't work is the lack of a leading zero. There is some argument in publishing circles about the use of the leading zero (see Math Forum - Ask Dr. Math and APA Style Blog: A Post About Nothing). However, I always use a leading zero for decimals less than one, even with hand calculations. It just makes the number easier to read and the decimal place more obvious. It appears that Prime agrees.
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