According to these following articles:
- The Chicago Manual of Style Online:
Numbers: Q. When referring to decimals from zero to one, are they singular or plural? - Stack Exchage (English Language & Usage):
Should we use plural or singular for a fraction of a mile? - WordReference Forums:
fraction/ decimal number + noun (singular or plural?)
all decimals use plural form for its units regardless of the integer part being zero, one, two, etc.
i.e.: 0.8 miles, 1.8 miles, 2.8 miles, etc.
Let us now assume we have "$1.01", a decimal with money units. Although the written form contains decimal point, which is the correct way of saying it <A> or <B>?
(Note: what is in between "[ ]" below is optional, you can say it with or without it)
- <A>: one dollar [and] one [cent] = both singular form of units
- <B>: one dollars [and] one [cents] = both plural form of units
I believe for "$1.01", although it is in decimal format, <A> is the correct one. This is because the decimal point act rather like a delimiter between 2 units (dollar and cent) with 1 as a value ... rather than as a decimal point with 1 unit (dollar).
Out of curiosity, if someone said "$1.01" in decimal format with 1 unit (dollar), then is the following the only valid way of saying it (with plural form of the units).
- one point zero one dollars