The difference between 51 and 36 is: 
The difference between 71 and 50 is: 
The difference between 59 and 36 is: 
The difference between 51 and 30 is: 
The difference between 91 and 36 is: 
The difference between 51 and 16 is: 
The difference between 58 and 33 is: 
The difference between 51 and 36 is: 