The difference between 87 and 30 is: 
The difference between 80 and 78 is: 
The difference between 83 and 30 is: 
The difference between 87 and 31 is: 
The difference between 57 and 30 is: 
The difference between 87 and 40 is: 
The difference between 93 and 36 is: 
The difference between 87 and 30 is: 