The difference between 78 and 51 is: 
The difference between 69 and 15 is: 
The difference between 73 and 51 is: 
The difference between 78 and 55 is: 
The difference between 88 and 51 is: 
The difference between 78 and 21 is: 
The difference between 86 and 59 is: 
The difference between 78 and 51 is: 