The difference between 63 and 50 is: 
The difference between 90 and 74 is: 
The difference between 64 and 50 is: 
The difference between 63 and 52 is: 
The difference between 63 and 50 is: 
The difference between 63 and 20 is: 
The difference between 72 and 59 is: 
The difference between 63 and 50 is: 