The difference between 68 and 18 is: 
The difference between 99 and 38 is: 
The difference between 69 and 18 is: 
The difference between 68 and 16 is: 
The difference between 78 and 18 is: 
The difference between 68 and 38 is: 
The difference between 62 and 17 is: 
The difference between 68 and 18 is: 