The difference between 63 and 15 is: 
The difference between 73 and 42 is: 
The difference between 67 and 15 is: 
The difference between 63 and 10 is: 
The difference between 23 and 15 is: 
The difference between 63 and 35 is: 
The difference between 69 and 11 is: 
The difference between 63 and 15 is: 