I've been thinking about this and wondering about the grammar. It should be easy to extend, but is "one hundred and ten dozen" allowable? If so, it should equal "one hundren and six score", but both seem a bit odd.

If you want a real challenge, try to add fractions. Should "three and nine-halves" be allowed? What about "one half million and thirteen hundred"? Mixing real numbers should probably be allowed, though. Allowing "3.5 million" seems sensible.

If so, it should equal "one hundren and six score", but both seem a bit odd.

Or just "eleven score."

I would think that, if dozen was used, it would be the highest denomination (and similarly for score.) So "one hundred and ten dozen" should probably be "eighteen dozen and four."

Update: Then again, in deciding on what to accept as input, you should probably be liberal as possible and accept even bizarre things like "one thousand one hundred twenty score eight dozen and four" for 1500.

-sauoq
"My two cents aren't worth a dime.";