The difference between 68 and 40 is: 
The difference between 47 and 20 is: 
The difference between 63 and 40 is: 
The difference between 68 and 42 is: 
The difference between 78 and 40 is: 
The difference between 68 and 40 is: 
The difference between 73 and 45 is: 
The difference between 68 and 40 is: 