The difference between 70 and 21 is: 
The difference between 94 and 73 is: 
The difference between 74 and 21 is: 
The difference between 70 and 20 is: 
The difference between 30 and 21 is: 
The difference between 70 and 61 is: 
The difference between 79 and 20 is: 
The difference between 70 and 21 is: 