In recent times, 100 popularbooktokbookslist challenges has become increasingly relevant in various contexts. "a 100" vs "100" - English Language & Usage Stack Exchange. The flow rate increases 100-fold (one hundred-fold) Would be a more idiomatic way of saying this, however, the questioner asks specifically about the original phrasing. The above Ngram search would suggest that a one hundred has always been less frequently used in written language and as such should probably be avoided. Your other suggestion of by one hundred times is definitely better than a ...
Is it proper to state percentages greater than 100%? Technically, "percent" should mean "for every hundred". In this context, so, I would think that it's perfectly fine to say "150%". However, in common usage, people rarely say percentages greater than a hundred.
It's important to note that, "centurial" - describing periods of 100 years. relating to 100 years : marking or beginning a century, with the example "the centurial years 1600 and 1700". But there is a word that is widely used to indicate the range of years or centuries covered by an article or book: history.

Why is "a 100% increase" the same amount as "a two-fold increase"?. If you have an increase of 100% then you have a total of twice what you started with. A twofold increase should be the same as a 200% increase which ought to mean you have 3 times as much as when you started. What was the first use of the saying, "You miss 100% of the shots you .... You miss 100 percent of the shots you don't take.
It's important to note that, kanter, "AARP—Asset Accumulation, Retention and Protection," Taxes 69: 717: "Wayne Gretzky, relating the comment of one of his early coaches who, frustrated by his lack of scoring in an important game told him, 'You miss 100% of the shots you never take.'" ... word choice - Is it less than $100 or under $100? In this context, is it more than $100 .... All of your variants are grammatically correct, and will be easily understood by native English speakers.

The less than X is idiomatically identical to under X when referring to monetary amounts, as is more than X with over X. However, if your audience is international, you might prefer to say items costing less than X or items costing more than X simply to avoid any possibility of confusion ... Numbers with more than 100 zeros - English Language Learners Stack Exchange. In a scientific or mathematical context they might occur, in which case you should use standard index form 1×10¹⁰⁰ for one followed by 100 zeros. There is the joke word "googol" for this. The meaning of 0% and 100% as opposed to other percentages?.
"100%" is equivalent to "all". There is no rounding with "all"; either you get all of something or you don't. In this context, if a product advertised itself as "kills all bacteria" and then you found that there were 3 bacteria that it didn't kill, it doesn't matter whether that's 3 out of 10 or 3 out of 28 million; it's not all of them. Even in ordinary conversation, if your child says "I picked up all the ...


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