Subject/Verb Agreement Part IV
When fractions are used in sentences, the author must determine the meaning and match the verb accordingly:
One-third of the membership is absent. (Membership is singular and the matching verb is singular).
Half of the members plan to veto the bill. (Members determines the verb usage. The word is plural, therefore, the matching verb will be plural.
But what about mathematical processes? Those are always expressed with a singular verb:
Twelve divided by three is four.
Five and five is ten.