It's nice to see Dutch included in the 'learn to count' classes
Since there're allready 3 versions, I suggest you include a 4th one :
Dutch(Belgian-Flemish)
Differences are minimal :
    There is a 'en' between the 100's and the 10's if the 10's are below
13
eg :
        512 : dutch : vijfhonderdtwaalf
                 flemish : vijfhonderdENtwaalf
        522 : dutch : vijfhondertweeentwintig
                 flemish : vijfhonderdtweeentwintig        (no
difference)
So, above pattern is valid for 101-112, 201-212, .....
1000's do not influence this
Danny