The difference between 61 and 28 is: 
The difference between 76 and 18 is: 
The difference between 69 and 28 is: 
The difference between 61 and 20 is: 
The difference between 51 and 28 is: 
The difference between 61 and 38 is: 
The difference between 64 and 21 is: 
The difference between 61 and 28 is: 