Welsh Numbers

In welsh we have a traditional counting system that is based on twenties, sof the jecimal system. So rather than going every ten, you go every 20. We have another system then which does go by every ten, which is much closer to the english system. One to ten is the same in both systems. But where it starts to get different is readyto get past 30. 31 in welsh would be inardegaigan. That's one on ten and 20. In the vigesimal system, then when you get to ten and past ten, you should add the number on. 11 would been inardeg which is one on ten. 14 would be ped