I have now completed my second app which is shown here. I am simply wanting to thank all of you who have persisted in giving me guidance, without you I would have never have been able to get off the ground. When I first came to Livecode, without having ever had anything to do with programming at all my whole life, I did not even know what a handler or a variable was, in fact I saw a reference to 'ruby on rails' and thought it was a gorgeous American lass sliding down the bannister with a glass of champagne in her hand.

I am now thinking up my next exercise (??) but felt that so much credit is due to a number of people on this forum. Your time is appreciated.
As a side note I inserted an 'on mouseEnter' into the left field so that the far right hand field (result) would look nicely empty when the user (my wife) inserts her next digit. I originally coded it with an 'on mouesDown' with the number 1 - as given in the dictionary but for some reason this failed. maybe I misunderstood its purpose here?
Anyway, time now to devise a new headache for myself...Mmm...