The difference between 87 and 13 is: 
The difference between 51 and 42 is: 
The difference between 88 and 13 is: 
The difference between 87 and 13 is: 
The difference between 57 and 13 is: 
The difference between 87 and 73 is: 
The difference between 93 and 19 is: 
The difference between 87 and 13 is: 