The difference between 64 and 24 is: 
The difference between 68 and 30 is: 
The difference between 68 and 24 is: 
The difference between 64 and 23 is: 
The difference between 54 and 24 is: 
The difference between 64 and 24 is: 
The difference between 60 and 21 is: 
The difference between 64 and 24 is: 