The graphic is correct. "Halvfems" is shorthand for "halvfemsindstyvende" which roughly means; halfway to the fifth twenty. So 4,5 or 4-1/2 "twenties" so 90. But nobody rally thinks about that. To most Danes "halvfems" is just the name for 90, just like ninety is in English...

[–] Pilon23@feddit.dk 1 points 8 months ago (1 children)

It should rather be 9 + (5 - 1/2) * 20. Halvfems is halfway from 4 to 5, but the 5 is the value explicitly mentioned

[–] ArcaneGadget@lemmy.world 2 points 8 months ago (1 children)

Yes. That is what i said? "Halfway to the fifth" which i clarified to mean 4,5 in this context, so as to not be confused to mean 2,5.

[–] Pilon23@feddit.dk 1 points 8 months ago

Yeah 5-1/2 is 4.5, but the word "fems" is short for femsindstyvende, which means 5x20, so writing it out as (5-1/2) rather than 4.5 matches the word halvfems more closely. Could also write it out as (-1/2 + 5) i suppose