Numbers (Eng)

• Two-and-a-half thousand (2,500) 
(Here, the noun being modified isthousand. That is why there is no hyphen between Two-and-a-half andthousand.)
• Two-and-a-half-thousand soldiers 
(Here, the compound adjective isTwo-and-a-half-thousand. In this example, thousand is part of the adjective modifying soldiers.)
• 3-and-a-quarter million (3,250,000) 
• 3-and-a-quarter-million pounds 
• one-and-a-half dozen (18) 
• one-and-a-half-dozen eggs