The difference between 28 and 18 is: 
The difference between 84 and 68 is: 
The difference between 29 and 18 is: 
The difference between 28 and 12 is: 
The difference between 88 and 18 is: 
The difference between 28 and 18 is: 
The difference between 20 and 14 is: 
The difference between 28 and 18 is: 