For numbers 11 to 19, just add عَشَر 'ashar at the end of the number, like this:
أَحَادَ عَشَر ahaada 'ashar, 11
أِثْنَا عَشَر ithnaa 'ashar, 12
ثَلَاثَة عَشَر thalaatha 'ashar, 13
عَرْبَعَة عَشَر 'arba'a 'ashar, 14
خَمْسَة عَشَر khamsa 'ashar, 15
سِتَّة عَشَر sitta 'ashar, 16
سَبْعَة عَشَر sab'a 'ashar, 17
ثَمَانِيَة عَشَر thamaaniya 'ashar, 18
تِسْعَة عَشَر tis'a 'ashar, 19
My comments
- Number 11 is أَحَادَ عَشَر and not وَاحِد عَشَر but I don't know why :)
- Watch the transliteration (pronunciation) carefully.
