The difference between 61 and 37 is: 
The difference between 99 and 28 is: 
The difference between 68 and 37 is: 
The difference between 61 and 30 is: 
The difference between 51 and 37 is: 
The difference between 61 and 47 is: 
The difference between 66 and 32 is: 
The difference between 61 and 37 is: 