The difference between 61 and 42 is: 
The difference between 99 and 20 is: 
The difference between 69 and 42 is: 
The difference between 61 and 40 is: 
The difference between 61 and 42 is: 
The difference between 61 and 42 is: 
The difference between 69 and 40 is: 
The difference between 61 and 42 is: 