Plural verbs are normally used in this case. A NUMBER OF is a quantifying expression (like A GROUP OF, A COUPLE OF, THE MAJORITY OF, and so on). JK
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AnonymousWhich one is correct: There was a number of my friends at the concert or There were a number of my friends at the concert ?were. The agreement is with the noun after 'a number of', so were friends. And 'a number of' always takes a plural.