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"one and a half months" vs "one and a half month"

The correct phrase would be "one-and-a-half months." Since we are dealing with more than one, we need the plural.

Last Updated: December 10, 2017

one and a half months

This is correct

This is a phrase that indicates a particular time period.

ExpertExplanation provided by a TextRanch English expert


Some examples from our editors:

  • I knew her for about one and a half months.
  • The process is expected to take one and a half months.

Some alternatives from our editors:

  • six weeks
  • a month and a half

one and a half month

This is not correct. Don't use this phrase.

Since one and a half is more than one, you have to use the plural of months.

ExpertExplanation provided by a TextRanch English expert


Some alternatives from our editors:

  • one and a half months

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