Just a Number 26 9, 6:58pm

@canary1212 #9780936
It is not. It is half fifth times twenty. That is four and half of the fifth, so 4½ times 20.

Did you know that the name of the Roman coin sesterts is short for semi-terts, half third? It was worth half third denarius, that is 2½ denarius.

This way of specifying a half less than a number is no longer used in Danish, except for halvanden, half second, which is 1½.