The difference between 42 and 21 is: 
The difference between 98 and 47 is: 
The difference between 43 and 21 is: 
The difference between 42 and 21 is: 
The difference between 32 and 21 is: 
The difference between 42 and 21 is: 
The difference between 50 and 29 is: 
The difference between 42 and 21 is: 