Displaying Numbers in Words

Here is a more concise version that can also be easily extended to more digit triplets, since the lookup table will be the same for each of the triplets.

Spelt2 = 
var l = {("1","one","eleven","ten"),("2","two","twelve","twenty"),("3","three","thirteen","thirty"),
("4","four","fourteen","fourty"),("5","five","fifteen","fifty"),("6","six","sixteen","sixty"),
("7","seven","seventeen","seventy"),("8","eight","eighteen","eighty"),("9","nine","nineteen","ninety")}
var t = "0" & format(ParameterNumber[ParameterNumber Value],"#")
var s = right(t,1)
var d = left(right(t,2),1)
var h = left(right(t,3),1)
var sd = if(d="1",concatenatex(filter(l,[Value1]=s),[Value3]),concatenatex(filter(l,[Value1]=s),[Value2]))
var dd = if(d>"1" || d & s = "10",concatenatex(filter(l,[Value1]=d),[Value4]) & " ")
var hd = if(h>"0",concatenatex(filter(l,[Value1]=h),[Value2]) & " hundred ")
return hd & dd & sd 

Here's the version for up to six digits:

Spelt2 = 
var l = {("1","one","eleven","ten"),("2","two","twelve","twenty"),("3","three","thirteen","thirty"),
("4","four","fourteen","fourty"),("5","five","fifteen","fifty"),("6","six","sixteen","sixty"),
("7","seven","seventeen","seventy"),("8","eight","eighteen","eighty"),("9","nine","nineteen","ninety")}
var t = "0" & format(ParameterNumber[ParameterNumber Value],"#")
var s = right(t,1)
var d = left(right(t,2),1)
var h = left(right(t,3),1)
var ss = if(d="1",concatenatex(filter(l,[Value1]=s),[Value3]),concatenatex(filter(l,[Value1]=s),[Value2]))
var dd = if(d>"1" || d & s = "10",concatenatex(filter(l,[Value1]=d),[Value4]) & " ")
var hd = if(h>"0",concatenatex(filter(l,[Value1]=h),[Value2]) & " hundred ")
var s2 = left(right(t,4),1)
var d2 = left(right(t,5),1)
var h2 = left(right(t,6),1)
var ss2 = if(d2="1",concatenatex(filter(l,[Value1]=s2),[Value3]),concatenatex(filter(l,[Value1]=s2),[Value2])) 
var dd2 = if(d2>"1" || d2 & s2 = "10",concatenatex(filter(l,[Value1]=d2),[Value4]) & " ")
var hd2 = if(h2>"0",concatenatex(filter(l,[Value1]=h2),[Value2]) & " hundred ")
return if(ss2>"",hd2 & dd2 & ss2 & " thousand ") & hd & dd & ss 

In action: