Well, sometimes you do. For instance, when the number forms a compound adjective like 'thirty-page manuscript', but it's not a strict rule for all number usage.
Not necessarily. Hyphenating numbers in a novel is a matter of style and context. If it helps the readability or makes the meaning clearer, then go for it. But if it doesn't add value, you can skip it.
Not usually. Hyphenating numbers in a novel is rare and not a common practice.
Yes, you should hyphenate 'non-fiction'. It's the standard way to write it to make the meaning clear.
It depends. Sometimes you might need to hyphenate 'age' depending on the context and the specific usage in your writing.
It depends. In some cases, hyphenating 'age' might be necessary for clarity or to follow specific style guidelines. But often, it's not mandatory.
It depends. In some cases, spelling out numbers makes the text more reader-friendly, especially for smaller numbers. But for larger numbers or technical writing, using numerals can be more efficient.
It depends on the style guide or the specific rules of the genre. Generally, numbers one through ten are written out, while larger numbers are expressed numerically.
Numbers can be written as numerals for clarity in most cases. For example, '5 people' or '10 days'. But in some literary contexts, they might be spelled out, like 'five people' or 'ten days'.
You can write numbers as words for small values and use numerals for larger ones. For example, write 'three' for 3 but '100' for a hundred.
It depends. Usually, numbers one through ten are written out as words, and larger numbers are presented as numerals. But there are exceptions based on style guides and the context.
It depends. In some cases, spelling out numbers makes the text more reader-friendly, especially for smaller numbers. But for large numbers or in technical or scientific contexts, using numerals might be better.