The difference between 68 and 13 is: 
The difference between 39 and 29 is: 
The difference between 69 and 13 is: 
The difference between 68 and 15 is: 
The difference between 58 and 13 is: 
The difference between 68 and 53 is: 
The difference between 74 and 19 is: 
The difference between 68 and 13 is: 