The difference between 59 and 31 is: 
The difference between 63 and 21 is: 
The difference between 52 and 31 is: 
The difference between 59 and 30 is: 
The difference between 99 and 31 is: 
The difference between 59 and 21 is: 
The difference between 61 and 33 is: 
The difference between 59 and 31 is: 