Should we also modify 'twenty-one' for example when it is one hundred and twenty one? <br/><br/><i>1. Use hyphens with compound numbers between twenty-one and ninety-nine. For example:</i><br/><ul><br/><li><i>twenty-one </i><br/><li><i>forty-five </i><br/><li><i>seventy-seven </i><br/><li><i>ninety-nine </i></li><br/><br/><i>Also use hyphens to separate numerators and denominators in fractions. For example:</i><br/><ul><br/><li><i>one-half </i><br/><li><i>two-thirds </i><br/><li><i>five-eights </i><br/><li><i>three-tenths</i></li><br/><br/>What about one-and-a-half?<br/><br/>Should we use the hyphen when these numbers above modify nouns, as well as when they don't modify anything?<br/><br/>Thanks <br/></li></li></li></ul></li></li></li></ul>