The example cited in the page of instruction regarding ''Expressing intervals of dates and times in French = from ... to' is 'The festival lasts from the 24th of July to the 5th of August'/'Le festival dure du 24 juillet au 5 août'.
I am therefore puzzled by the answer to the fill-in the-blank question 'Le festival dure ________ mai/The festival lasts from the third to the tenth of May'. My answer was 'du troisième au dixième', while the answer provided as a correction was 'du trois au dix'
Perhaps I'm being stupid, but my answer seems to follow the example better than the correction. Where is my error?
Your error is that in French we don't use ordinal numbers for dates apart from 'premier' (first).
So the answer would be
Take a look at the following lesson -
Expressing dates in French
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