Convert a text value to a numeric vale

Hi all 

I have a column type text that contains numbers and text : I want to apply the follwoing script : 

when I apply this I get the follwoing message : 

I treid to use convert , but it did not work .. 
the idea that if I instead of using VAR , i build a separate measure for each one , then it will work !!! 

Any suggestions 🙂 
thanks in advance 
regards