coins For dungeons and dragons & Tabletop Games

I started to make a base. But i liked it so i made some coins to.1,,5,10,20,30,40,50,100 gold
The I = 1 gold
V=5
v+1 o = 10
v+2 o = 20
...etg
But you can use it as you like. 1,5,10,20,... or 1 silver, 5 silver, 1 gold, 20 gold,...