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To illustrate, this reads a bit awkward:

In a country with 75 billion SMBs, at least seven billion of them should advertise.

What's the acceptable practice in such sentences ?

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up vote 5 down vote accepted

The writing style I have come across most often is to write out in words numbers of ten or less (occasionally twelve or less) and use digits for all higher numbers.

In a sentence, using words gives a better flow, but obviously with higher numbers that flow would break down anyway, so I think your sentence works just fine as is.

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Thanks for spelling it out. I would have voted for you if I had the karma :| – 0xff0000 Apr 15 '11 at 9:55

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