The difference between 99 and 21 is: 
The difference between 88 and 26 is: 
The difference between 92 and 21 is: 
The difference between 99 and 24 is: 
The difference between 89 and 21 is: 
The difference between 99 and 51 is: 
The difference between 103 and 25 is: 
The difference between 99 and 21 is: 