The difference between 90 and 68 is: 
The difference between 89 and 69 is: 
The difference between 99 and 68 is: 
The difference between 90 and 60 is: 
The difference between 90 and 68 is: 
The difference between 90 and 48 is: 
The difference between 99 and 67 is: 
The difference between 90 and 68 is: 