The difference between 87 and 70 is: 
The difference between 57 and 49 is: 
The difference between 82 and 70 is: 
The difference between 87 and 73 is: 
The difference between 87 and 70 is: 
The difference between 87 and 30 is: 
The difference between 90 and 73 is: 
The difference between 87 and 70 is: 