> I don't believe Tolkien created a way to write numbers past 12. Things might've changed since the last time I checked (or maybe I just researched it badly, hehe), since there are plenty of Tolkien linguists, so I'll look into it. And if they don't have a way, I'll come up with a way. Sometime... *grins*I found it. As per The Tolkien Companion by J.E.A. Tyler, these are the numbers.
1 tinco 2 parma 3 calma 4 quesse 5 ando
6 umbar 7 anga 8 ungwe 9 thule/sule 10 formen
11 harma/aha 12 hwesta 13 anto 14 ampa
15 anca 16 unque 17 numen 18 malta 19 noldo 20 nwalme 21 ore 22 vala 23 anna 24 vilya
25 romen 26 arda 27 lambe 28 alda 29 silme
30 silme nuquerna 31 are/esse 32 are nuquerna
33 hyarmen 34 hwesta sindarinwa 35 yanta
36 ure
That's as high as it goes.