My mother tongue is Dutch. From 1 to 10: één, twee, drie, vier, vijf, zes, zeven, acht, negen, tien. From 10 to 20: elf, twaalf, dertien, veertien, vijftien, zestien, zeventien, achttien, negentien, twintig. Basically, elf and twaalf are seperate words much like eleven and twelve in English. From 13 onwards, you put a word that resembles 3, 4, 5 and so on, in front of 'tien' (10) and the other numbers are formed. The same goes for 20: twintig and then, eenentwintig, tweeëntwintig, drieëntwintig, vierentwintig for 21, 22,23, 24 and so on. From 100 it works in reverse: 101 is honderd en één. From 200 it becomes: tweehonderd (two hundred) This is to give you some idea.