1 = one, maar 1ste = first
2 = two, maar 2de = second
3 = three, maar 3de = third
5 = five, maar 5de = fifth
8 = eight, maar 8ste = eighth
9 = nine, maar 9de = ninth
12 = twelve, maar 12ste = twelfth
20 = twenty, maar 20ste = twentieth
31 = thirty-one, maar 31ste = thirty-first