The difference between 64 and 27 is: 
The difference between 90 and 33 is: 
The difference between 68 and 27 is: 
The difference between 64 and 23 is: 
The difference between 74 and 27 is: 
The difference between 64 and 57 is: 
The difference between 68 and 21 is: 
The difference between 64 and 27 is: 