The difference between 90 and 69 is: 
The difference between 81 and 55 is: 
The difference between 99 and 69 is: 
The difference between 90 and 60 is: 
The difference between 70 and 69 is: 
The difference between 90 and 29 is: 
The difference between 92 and 61 is: 
The difference between 90 and 69 is: 