The difference between 68 and 64 is: 
The difference between 63 and 30 is: 
The difference between 66 and 64 is: 
The difference between 68 and 66 is: 
The difference between 98 and 64 is: 
The difference between 68 and 54 is: 
The difference between 73 and 69 is: 
The difference between 68 and 64 is: 