It should be hyphenated if used as a noun clause, but not if used as an adjective
No, it is not correct grammar to write About a year and a half year ago.The correct way: about a year and a half ago.Example sentences:The family moved out about a year and a half ago.About a year and a half ago, I broke my ankle.The phrase "about a year and a half ago" means "about 18 months ago".
Fine-tune is an 8 letter hyphenated word. High-tech, half-mast, half-moon are additional hyphenated words.
No
Hyphenated
One-half is a hyphenated word. It begins with the letter O.
Yes, "half-page ad" should be hyphenated to show that "half" and "page" are acting together as a compound adjective to describe "ad."
Yes, it is a hyphenated compound half-eaten
It's Harry Potter and the Half-Blood Prince.
Yeah. Is that how much you weigh?
one-half
Hyphenating is a matter of choice and what makes a sentence clearer; rules about hyphens leave some room for a writer's own judgment. For example, the question, 'Is one half hyphenated?" could be read as, 'Is one-half hyphenated?", or 'Is one half-hyphenated....' (A half-hyphenated what?). It is an oversimplified example, but it doesn't take much to confuse. Another example, 'English language learners...'; is this people from England learning a language or learners of the English language. The use of a hyphen, makes it clear, 'English-language learners...'The purpose of hyphenating is to overcome ambiguity.
Yes, it should be hyphenated like so: sixteen-year-old boys.