fractions: agreement, hyphenation, and style
How a fraction takes a verb, and when it takes a hyphen.
Hyphenate a simple fraction in every use: a two-thirds share, two-thirds of the votes. The verb follows the noun after of: Two-thirds of the cake is gone. Two-thirds of the clerks are gone.
Examples
Use a two-thirds majority
Use Two-thirds of the paper is wet.
Use Two-thirds of the pages are wet.
Avoid a two thirds majority