The difference between 90 and 39 is: 
The difference between 55 and 30 is: 
The difference between 99 and 39 is: 
The difference between 90 and 30 is: 
The difference between 90 and 39 is: 
The difference between 90 and 29 is: 
The difference between 96 and 35 is: 
The difference between 90 and 39 is: 