'Two and a half' in the Bible

"They are to make an ark of acacia wood, two and a half cubits long, one and a half cubits wide, and one and a half cubits high.

"You are to make a Mercy Seat of pure gold, two and a half cubits long and one and a half cubits wide.

Bezalel made the ark of acacia wood two and a half cubits long, one and a half cubits wide, and one and a half cubits high.

He made a Mercy Seat of pure gold two and a half cubits long and one and a half cubits wide.

These two and a half tribes received their inheritance this side of the Jordan River, east of Jericho, facing the rising sun."