Fems is the short as you say, but that isn’t really possible to translate correctly. Thats why people translate it to fifth. The proper danish for a fifth is en femtedel. I might be mistanken here, but I dont think any dane would ever talk about 4.5 as halv fem (half five), but as fire komma fem.
The exception is when we talk about the time in the nordics. Then half passes four is half five.
Half fifth isn’t 4.5 but 90 because of 4.5 * 20. Its the same with half third being 50 and half fourth is 70.
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Norwegian, but I was tought this by a dane.
Fems is the short as you say, but that isn’t really possible to translate correctly. Thats why people translate it to fifth. The proper danish for a fifth is en femtedel. I might be mistanken here, but I dont think any dane would ever talk about 4.5 as halv fem (half five), but as fire komma fem.
The exception is when we talk about the time in the nordics. Then half passes four is half five.