The difference between 29 and 18 is: 
The difference between 49 and 34 is: 
The difference between 29 and 18 is: 
The difference between 29 and 16 is: 
The difference between 79 and 18 is: 
The difference between 29 and 18 is: 
The difference between 30 and 19 is: 
The difference between 29 and 18 is: 