The difference between 51 and 49 is: 
The difference between 94 and 75 is: 
The difference between 59 and 49 is: 
The difference between 51 and 40 is: 
The difference between 91 and 49 is: 
The difference between 51 and 29 is: 
The difference between 59 and 47 is: 
The difference between 51 and 49 is: 