The difference between 57 and 31 is: 
The difference between 90 and 67 is: 
The difference between 57 and 31 is: 
The difference between 57 and 30 is: 
The difference between 47 and 31 is: 
The difference between 57 and 31 is: 
The difference between 61 and 35 is: 
The difference between 57 and 31 is: 