The difference between 68 and 23 is: 
The difference between 99 and 87 is: 
The difference between 64 and 23 is: 
The difference between 68 and 24 is: 
The difference between 58 and 23 is: 
The difference between 68 and 33 is: 
The difference between 72 and 27 is: 
The difference between 68 and 23 is: 