The difference between 51 and 42 is: 
The difference between 87 and 30 is: 
The difference between 58 and 42 is: 
The difference between 51 and 40 is: 
The difference between 51 and 42 is: 
The difference between 51 and 42 is: 
The difference between 59 and 40 is: 
The difference between 51 and 42 is: 