The difference between 42 and 20 is: 
The difference between 61 and 51 is: 
The difference between 44 and 20 is: 
The difference between 42 and 21 is: 
The difference between 32 and 20 is: 
The difference between 42 and 30 is: 
The difference between 50 and 28 is: 
The difference between 42 and 20 is: 