# Correct usage of (n)fold, where n is any integer greater than or equal to one? [closed]

Writing a rhetorical piece for my high school english class, I wanted to emphasize the sheer increase from 10 million to approximately 2 billion.

Conveniently, 10 million is 200 times smaller than 2 billion. That makes a nice, clean number to work with, even though it really doesn't have any significance on the quesiton I'm asking here.

What I wanted to do is to say something like this:

``````two hundredfold
``````

or

``````two hundred-fold
``````

Just as

``````twofold
``````

means two times as many. The pattern appears to be placing the number before `fold` like `threefold`, `fourfold`, `fivefold`, etc.

Yet, with something like two hundred, how should I space, hyphenate and spell it correctly?

## closed as general reference by aedia λ, Robusto, simchona, user2683, DanielSep 28 '11 at 0:27

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information. If this question can be reworded to fit the rules in the help center, please edit the question.

@Mike's answer is simply wrong. Firstly because hundredfold is not a noun, it's an adjective/adverb, and secondly because the correct form for two of them is two hundredfold, for which there are over 1700 written instances in that link (and not a single one for the pluralised version).

Note that in principle the -fold suffix can be attached to any number term, and it's irrelevant if that term includes spaces, as in two hundred. I don't think anyone would ever write one hundred and forty-fourfold, but it would be valid.

But it's worth noting that hundredsfold is valid, because although it's imprecise, hundreds is a valid number term.

"Two hundredfolds" is not correct, and "hundredfold" is not a noun. From NOAD:

-fold |fəʊld|
suffix