The difference between 80 and 49 is: 
The difference between 52 and 15 is: 
The difference between 89 and 49 is: 
The difference between 80 and 40 is: 
The difference between 90 and 49 is: 
The difference between 80 and 29 is: 
The difference between 89 and 48 is: 
The difference between 80 and 49 is: 