The difference between 68 and 21 is: 
The difference between 59 and 16 is: 
The difference between 67 and 21 is: 
The difference between 68 and 25 is: 
The difference between 68 and 21 is: 
The difference between 68 and 11 is: 
The difference between 76 and 29 is: 
The difference between 68 and 21 is: 