The difference between 90 and 23 is: 
The difference between 92 and 31 is: 
The difference between 99 and 23 is: 
The difference between 90 and 20 is: 
The difference between 40 and 23 is: 
The difference between 90 and 23 is: 
The difference between 99 and 22 is: 
The difference between 90 and 23 is: 