The difference between 98 and 79 is: 
The difference between 37 and 21 is: 
The difference between 99 and 79 is: 
The difference between 98 and 71 is: 
The difference between 98 and 79 is: 
The difference between 98 and 49 is: 
The difference between 99 and 70 is: 
The difference between 98 and 79 is: 