The difference between 61 and 51 is: 
The difference between 98 and 64 is: 
The difference between 66 and 51 is: 
The difference between 61 and 50 is: 
The difference between 61 and 51 is: 
The difference between 61 and 41 is: 
The difference between 64 and 58 is: 
The difference between 61 and 51 is: 