- 0.9 meters
- 1.0 meters
- 1.1 meters
I thought if we want to use the plural, the number of the noun should be 2 or more than 2.
So Why should*"0.9 meters" and "1.0 meters"* use "meters " not "meter"?
You use the plural when the number is not 1, and not a fraction with numerator 1. So you say "one quarter meter" and "0.25 meters".
For fractions with larger numerators, you would generally say "two thirds of a meter". You should do the same thing for fractions with numerator 1 which aren't common: "one seventeenth of a meter". (What does "common" mean? Certainly 1/2, 1/3, 1/4, 1/10, and probably a few more. You can use the "of a" form for common fractions as well.)