Comment | re Londoner #62 BTW2:
I still think one-half, with the hyphen, is correct, and the Chicago Manual (13th ed.), table 6.1 'A Spelling Guide for Compound Words,' p. 177, seems to agree:
____________
Noun Forms —Continued Type: one-half Similar compounds: two-thirds, four and five-sevenths, but: thirty-one hundredths, three sixty-fourths Remarks: Type: spelled-out fractional number. Connect numerator and denominator with a hyphen unless either already contains a hyphen. ____________
So it still seems to me that the question should have read 'Divide 30 by one-half.'
(Or better, 'Divide 30 by 1/2,' or 'Divide thirty by one-half.')
Of course, it's also possible to write 'one half' when it's not a fractional number but a physical segment, e.g.,
Thanks for dividing the sandwich, but now one half looks bigger than the other half.
I think that would be Hälfte, right?
But I confess I'm not entirely clear on halb. On the face of it it looks as if it alone ought to be an adjective, but after ein wouldn't it become a noun and need capitalizing? This is too confusing. And for heaven's sake, don't anyone mention anderthalb, which sort of boggles my mind.
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