The Danish word for 99 is nioghalvfems, which literally means “nine and half five.” Which you could be forgiven for assuming meant 11½. The trick is that a) “half five” actually means 4½, as in half less than five, and b) it’s implied that you’re supposed to multiply the second part by 20. So the proper math is 9 + (-½ + 5) * 20 = 99.