Confusingly, Danish counting is also a mix of old norse counting systems (based on tens) and medieval ones (based on twenty) for maximum chaos. For instance the

Confusingly, Danish counting is also a mix of old norse counting systems (based on tens) and medieval ones (based on twenty) for maximum chaos. For instance the word for 40, fyrretyve (sounds like four-twenty), is derived from old norse fyritiughu, "four tens". It sounds like it SHOULD mean 80! But 80 is firs, or firsindstyve - four twenties.