The difference between 37 and 21 is: 
The difference between 59 and 35 is: 
The difference between 35 and 21 is: 
The difference between 37 and 23 is: 
The difference between 87 and 21 is: 
The difference between 37 and 11 is: 
The difference between 40 and 24 is: 
The difference between 37 and 21 is: 