The difference between 91 and 70 is: 
The difference between 63 and 12 is: 
The difference between 96 and 70 is: 
The difference between 91 and 70 is: 
The difference between 81 and 70 is: 
The difference between 91 and 40 is: 
The difference between 100 and 79 is: 
The difference between 91 and 70 is: 