The difference between 40 and 29 is: 
The difference between 73 and 20 is: 
The difference between 49 and 29 is: 
The difference between 40 and 20 is: 
The difference between 90 and 29 is: 
The difference between 40 and 39 is: 
The difference between 47 and 26 is: 
The difference between 40 and 29 is: 